Kidney Function Test (KFT) Explained: Normal Range, Creatinine, Urea, eGFR & Kidney Health (India 2026) | किडनी फंक्शन टेस्ट गाइड
Kidney Function Test (KFT) Explained: Normal Range, Creatinine, Urea, eGFR & Kidney Health (India 2026)
किडनी फंक्शन टेस्ट गाइड: Creatinine, Urea, eGFR, Uric Acid — नॉर्मल रेंज, CKD Stages और किडनी को कैसे बचाएं — पूरी जानकारी
Your routine health check or diabetic annual review has come back with a flagged KFT — creatinine 1.4 mg/dL, urea 48 mg/dL, eGFR 61 mL/min/1.73m² — and you are trying to understand what these values mean and whether your kidneys are at risk. Or perhaps you have hypertension or diabetes and your doctor is checking KFT every 3–6 months to monitor for early nephropathy. The Kidney Function Test (KFT), also called Renal Function Test (RFT), is the most important panel of blood and urine tests for assessing how well the kidneys are filtering waste products from the blood. India faces a severe kidney disease burden: an estimated 17% of Indian adults have Chronic Kidney Disease (CKD) — approximately 220 million people — and the vast majority are undiagnosed at the early stages when preservation of kidney function is still possible. Diabetes and hypertension are the two leading causes of CKD in India, collectively responsible for 40–50% of all CKD cases. This guide explains every parameter in the KFT panel — what each test measures, how to interpret the numbers, and what can be done to protect kidney function.
For the diabetes-related kidney damage component, see our Microalbumin/uACR guide and detailed eGFR guide. For reading lab reports generally, see our beginner's guide to blood test reports.
Routine check में KFT flagged: creatinine 1.4, urea 48, eGFR 61 — kidneys risk में हैं? या diabetes/hypertension में KFT monitoring है। India में 17% adults CKD — 220 million लोग — majority early stages में undiagnosed। Diabetes + hypertension = 40–50% CKD cases। यह guide KFT के हर parameter को explain करती है — normal range, interpretation, और kidney function protect करने के तरीके।Table of Contents / विषय सूची
- What Is KFT? / KFT क्या है?
- Serum Creatinine — The Key Filter Marker
- Blood Urea & BUN
- eGFR — The Most Important KFT Parameter
- CKD Staging — Understanding eGFR Levels
- Other KFT Parameters — Uric Acid, Electrolytes, Urine
- What Causes Raised Creatinine & eGFR Fall in India
- How to Protect Your Kidneys
- Test Preparation Checklist / टेस्ट की तैयारी
- Frequently Asked Questions / अक्सर पूछे जाने वाले सवाल
What Is KFT?
The Kidney Function Test (KFT), also called Renal Function Test (RFT) or kidney panel, is a set of blood tests (and often an accompanying urine test) that assess how effectively the kidneys are filtering waste from the blood, maintaining electrolyte balance, and regulating fluid and acid-base status. A standard Indian KFT panel typically includes: Serum Creatinine, Blood Urea (or BUN — Blood Urea Nitrogen), eGFR (estimated Glomerular Filtration Rate — calculated, not directly measured), and often Serum Uric Acid, Serum Electrolytes (Sodium, Potassium, Chloride, Bicarbonate), Serum Calcium, and Urine Routine examination.
KFT (Kidney Function Test / Renal Function Test) = blood tests का set जो assess करते हैं kidneys waste filter कर रही हैं, electrolyte balance maintain कर रही हैं, और fluid + acid-base regulate कर रही हैं। Standard Indian KFT panel: Serum Creatinine, Blood Urea/BUN, eGFR (calculated), Uric Acid, Electrolytes (Na, K, Cl, HCO₃), Serum Calcium, Urine Routine।- Serum Creatinine: The most widely used kidney marker. Creatinine is a breakdown product of phosphocreatine in muscle — produced at a nearly constant daily rate proportional to muscle mass. It is freely filtered by the glomerulus and not significantly reabsorbed, making its serum level a direct reflection of glomerular filtration rate. As GFR falls, creatinine accumulates → serum creatinine rises.
- Blood Urea / BUN: Urea is the primary excretory product of protein metabolism — the liver packages ammonia (from amino acid breakdown) into urea for safe urinary excretion. Unlike creatinine, urea is affected by protein intake, hydration status, and catabolic states (fever, infection, steroids). Urea rises in kidney failure but is less specific for GFR decline than creatinine.
- eGFR (estimated GFR): The most important single KFT parameter — calculated from serum creatinine, age, and sex using the CKD-EPI equation. Expressed as mL/min/1.73m². Directly determines CKD stage and guides management decisions including medication dosing, referral, and dialysis planning.
- Serum Uric Acid: Often included in KFT panels — elevated in CKD (reduced renal excretion) and is independently associated with CKD progression and cardiovascular risk. Also relevant to gout diagnosis.
- Electrolytes (Na, K, Cl, HCO₃): Failing kidneys lose the ability to regulate electrolyte concentrations — hyperkalaemia (high potassium) is the most immediately life-threatening consequence of advanced CKD and requires urgent management.
- Urine Routine (including protein/albumin): Proteinuria (protein leaking into urine through a damaged glomerular filter) is the earliest detectable sign of glomerular damage — appearing before creatinine rises significantly.
Serum Creatinine — The Key Filter Marker
*Creatinine reference ranges are sex-specific and affected by muscle mass. Values below are typical for Indian NABL-accredited labs. Units: mg/dL (some labs report µmol/L — divide by 88.4 to convert to mg/dL).
| Group | Normal Creatinine | Mildly Elevated | Significantly Elevated |
|---|---|---|---|
| Adult Men | 0.7–1.2 mg/dL | 1.2–1.5 mg/dL | >1.5 mg/dL — kidney function evaluation needed |
| Adult Women | 0.5–1.0 mg/dL | 1.0–1.2 mg/dL | >1.2 mg/dL — evaluate with eGFR |
| Children (varies with age) | 0.2–0.8 mg/dL (age-dependent) | Age-specific | Use age-specific paediatric ranges — adult ranges do not apply to children |
| Elderly (>65 years) | May appear "normal" at 1.0–1.2 despite significant GFR reduction | Muscle mass falls with age — creatinine appears low relative to true kidney impairment. Always calculate eGFR in the elderly — never rely on serum creatinine alone. | |
- The muscle mass problem: Creatinine production is directly proportional to muscle mass. A small, elderly Indian woman with very little muscle may have a serum creatinine of 0.9 mg/dL — apparently "normal" — but this same creatinine corresponds to an eGFR of only 52 mL/min/1.73m² (CKD Stage G3a). Her kidneys are functioning at barely half normal capacity, yet her creatinine appears fine. This "normal creatinine despite significant CKD" is one of the most dangerous diagnostic blind spots in Indian nephrology practice — and it disproportionately affects elderly women.
- Creatinine doubles only after 50% GFR loss: Because of renal reserve and creatinine physiology, serum creatinine roughly doubles for every 50% loss of GFR. A patient with two completely normal kidneys (GFR 120) may see their creatinine rise from 0.9 to only 1.2 mg/dL when GFR has already fallen from 120 to 60 — a 50% function loss that appears as a small, apparently minor rise in creatinine. This late and non-linear rise of creatinine relative to actual function loss is why eGFR is essential.
- Creatinine is affected by diet and exercise: Eating a large meat meal raises creatinine transiently (dietary creatine → creatinine). Intense exercise raises creatinine from muscle breakdown. Both can produce apparent creatinine elevations that resolve on a repeat test. For accurate baseline KFT, test in a standard fasting, non-exercised state.
Blood Urea & BUN
Blood Urea (reported in India as Blood Urea in mg/dL) or BUN (Blood Urea Nitrogen — used in Western labs, where only the nitrogen component of urea is measured) is the second most important KFT waste marker. The relationship between Blood Urea and BUN: Blood Urea (mg/dL) ÷ 2.14 = BUN (mg/dL). Indian labs almost always report Blood Urea; Western-format reports use BUN. The normal range for Blood Urea in India is typically 15–45 mg/dL (equivalent to BUN 7–21 mg/dL).
Blood Urea (India में mg/dL में report): protein metabolism का primary excretory product। BUN (Western labs): Blood Urea ÷ 2.14 = BUN। India में almost always Blood Urea report होता है। Normal: 15–45 mg/dL (BUN: 7–21 mg/dL)।| Blood Urea Level | Category | Interpretation & Common Causes |
|---|---|---|
| 15–45 mg/dL | Normal | Normal kidney function and nitrogen balance. No action needed unless other KFT parameters are abnormal. |
| 45–70 mg/dL | Mildly Elevated | Pre-renal causes (dehydration, high protein diet, fever/infection, post-surgical) or mild kidney impairment. Correlate with creatinine and eGFR. Urea:Creatinine ratio above 20 → pre-renal cause likely. |
| 70–150 mg/dL | Moderately Elevated | Significant kidney impairment (CKD G3–G4). Also consider: GI bleeding (blood protein breakdown), high catabolic states (severe infection, steroids). Nephrology referral warranted. |
| >150 mg/dL | Severely Elevated (Uraemia) | Advanced kidney failure (CKD G5 / acute kidney injury). Uraemic symptoms: nausea, vomiting, confusion, pericarditis. Dialysis threshold typically approached. Urgent nephrologist review. |
eGFR — The Most Important KFT Parameter
The eGFR (estimated Glomerular Filtration Rate) is calculated from serum creatinine, age, and sex using the CKD-EPI 2021 equation — the most widely used formula in current Indian nephrology practice. It estimates how many millilitres of blood the kidneys can completely filter per minute, normalised to a standard body surface area. Normal young adult eGFR: 90–120 mL/min/1.73m². eGFR is the primary parameter used to stage chronic kidney disease (CKD) and guide clinical decisions.
eGFR = serum creatinine + age + sex से CKD-EPI 2021 equation द्वारा calculate। Estimate करता है कि kidneys per minute कितना blood filter कर सकती हैं। Normal young adult: 90–120 mL/min/1.73m²। eGFR = primary parameter जो CKD stage और clinical decisions guide करता है।CKD Staging — Understanding eGFR Levels
| CKD Stage | eGFR (mL/min/1.73m²) | Description | Action / Management |
|---|---|---|---|
| G1 | ≥90 | Normal or high filtration — kidney damage present (proteinuria, haematuria, structural abnormality) but GFR preserved | Identify and treat underlying cause (diabetes, hypertension, autoimmune). Annual KFT + urine ACR. Aggressive BP control (target <130/80). HbA1c below 7%. |
| G2 | 60–89 | Mildly reduced — often age-appropriate in over-60s without structural damage | Same as G1. Consider nephrology referral if proteinuria is significant or rate of GFR decline is rapid (>5 mL/min/year). |
| G3a | 45–59 | Mildly to moderately reduced — significant CKD, complications beginning | Nephrology referral. Medication dose adjustment required (many drugs are renally cleared). Monitor: Hb (anaemia of CKD), calcium, phosphate, PTH, potassium. Protein restriction discussion. |
| G3b | 30–44 | Moderately to severely reduced | Nephrology care essential. Anaemia management (erythropoietin stimulating agents). Bone-mineral disease management (Vitamin D, phosphate binders). Plan for renal replacement therapy if trajectory declining. |
| G4 | 15–29 | Severely reduced — kidney failure approaching | Comprehensive preparation for renal replacement therapy (haemodialysis, peritoneal dialysis, or kidney transplant). AV fistula creation for haemodialysis. Transplant workup. Dietary restriction. |
| G5 | <15 | Kidney failure — dialysis or transplant required | Renal replacement therapy initiated (haemodialysis 3×/week or peritoneal dialysis). Transplant if suitable donor available. Palliative care discussion in elderly with significant comorbidities. |
Other KFT Parameters — Uric Acid, Electrolytes, Urine
Uric acid — the end product of purine metabolism — is excreted primarily by the kidneys (70%) and gut (30%). Normal range in India: men 3.4–7.0 mg/dL; women 2.4–6.0 mg/dL. Elevated uric acid (hyperuricaemia) in the KFT context has two clinical dimensions: (1) as a consequence of CKD — reduced renal excretion as kidney function declines means uric acid accumulates in the blood; (2) as a potential cause and accelerator of CKD — elevated uric acid causes intrarenal vasoconstriction, tubulointerstitial inflammation, and is independently associated with faster CKD progression. Very high uric acid (above 9–10 mg/dL) with gout attacks or tophi warrants urate-lowering therapy (allopurinol — the most widely used medication in India, requires dose reduction in CKD). In patients with CKD and asymptomatic hyperuricaemia (no gout), the decision to treat with allopurinol is individualised. See our Uric Acid guide for complete detail.
Uric Acid normal: men 3.4–7.0; women 2.4–6.0 mg/dL। CKD context: CKD consequence (reduced excretion → uric acid accumulate) AND CKD cause/accelerator (renal vasoconstriction, tubulointerstitial inflammation)। Very high (>9–10) + gout/tophi → allopurinol (CKD में dose reduction)। Asymptomatic hyperuricaemia in CKD → individualised decision।Among the electrolytes in the KFT panel, potassium deserves special attention — hyperkalaemia (high serum potassium) is the most immediately life-threatening complication of kidney failure. Normal range: 3.5–5.0 mEq/L. In advanced CKD, the kidneys lose the ability to excrete potassium → potassium accumulates → hyperkalaemia. Potassium above 5.5 mEq/L is significant; above 6.0 mEq/L is dangerous; above 7.0 mEq/L is a medical emergency with risk of fatal ventricular arrhythmia. Dietary potassium restriction becomes critical in CKD G3b and above: avoid banana, coconut water, tomato, potato, sweet potato, avocado, dried fruits, and fruit juices — all high-potassium foods that are commonly consumed in Indian diets and that can precipitate dangerous hyperkalaemia in CKD patients. The treating nephrologist monitors potassium at every CKD clinic visit.
Potassium normal: 3.5–5.0 mEq/L। Advanced CKD में kidneys K+ excrete fail → hyperkalaemia। K+ >5.5 = significant; >6.0 = dangerous; >7.0 = EMERGENCY (fatal arrhythmia risk)। CKD G3b+ में dietary K+ restriction: banana, coconut water, tomato, potato, sweet potato, dried fruits avoid। Nephrologist हर visit पर potassium monitor।Urine protein (proteinuria) — detected on urine routine examination or quantified as uACR (urine albumin:creatinine ratio on a spot urine sample) — is the earliest detectable sign of glomerular damage, appearing before serum creatinine rises significantly. A normal uACR is below 30 mg/g. Microalbuminuria (uACR 30–300 mg/g) is the key early warning sign of diabetic nephropathy and hypertensive nephropathy — both extremely common causes of CKD in India. Macroalbuminuria (uACR above 300 mg/g) indicates significant glomerular damage. Urine routine dipstick protein: trace = borderline; 1+ = approximately 30–300 mg/day; 2+ = 300–1,000 mg/day; 3+ = 1,000–3,000 mg/day; 4+ = above 3,000 mg/day (nephrotic range). Any person with diabetes or hypertension should have annual uACR testing alongside KFT — proteinuria is often the first KFT abnormality to appear and the most important target for treatment to slow CKD progression. See our Microalbumin/uACR guide.
Urine protein (uACR): earliest glomerular damage marker — creatinine rise से पहले। Normal uACR <30 mg/g। Microalbuminuria (30–300): diabetic + hypertensive nephropathy early warning। Macroalbuminuria (>300): significant damage। Dipstick: trace→1+→2+→3+→4+ (nephrotic range >3000 mg/day)। Diabetes/hypertension वाले: annually uACR + KFT। Proteinuria = most important CKD progression target।As kidney function declines below CKD G3, the kidneys lose the ability to excrete phosphate and to activate Vitamin D (the kidney is the primary site of conversion of 25-OH Vitamin D to active 1,25-dihydroxy Vitamin D). This sets off a cascade: high phosphate + low active Vitamin D → secondary hyperparathyroidism (the parathyroid glands massively overproduce PTH to try to pull calcium from bones and phosphate from the kidneys) → calcium-phosphate imbalance → vascular calcification (calcium deposits in blood vessel walls — a major cause of cardiovascular death in CKD patients) + renal osteodystrophy (weak, painful bones). In Indian CKD patients — where Vitamin D deficiency is already near-universal — this bone-mineral disease develops earlier and more severely than in Western CKD patients. Monitoring: serum calcium, phosphate, and PTH should be checked every 6 months from CKD G3a onwards. Management: dietary phosphate restriction, phosphate binders (calcium carbonate, sevelamer), active Vitamin D analogues (calcitriol, alfacalcidol), and calcimimetics (cinacalcet) in advanced cases.
CKD G3+ से: phosphate excretion fail + Vitamin D activation fail → secondary hyperparathyroidism → vascular calcification + renal osteodystrophy। India में Vitamin D already near-universally deficient → CKD में bone-mineral disease earlier, more severe। Monitoring: Ca, PO4, PTH every 6 months from G3a। Management: dietary phosphate restriction, phosphate binders (Ca carbonate, sevelamer), active Vit D (calcitriol), cinacalcet।What Causes Raised Creatinine & eGFR Fall in India
Diabetes mellitus — both type 1 and type 2, with type 2 overwhelmingly predominant in India — is the single most common cause of CKD and end-stage kidney disease (ESKD) in India, accounting for approximately 30–40% of new dialysis patients. The mechanism: chronic hyperglycaemia damages the glomerular basement membrane and mesangium → glomerulosclerosis (scarring of the filtration units) → progressive loss of nephrons → rising creatinine and falling eGFR. The progression is reliably predicted and can be significantly slowed by: tight glycaemic control (HbA1c below 7%), aggressive blood pressure control (below 130/80 mmHg), RAAS blockade with ACE inhibitors or ARBs (first-line protective agents for diabetic nephropathy — they reduce intraglomerular pressure and proteinuria independently of BP effect), and SGLT2 inhibitors (empagliflozin, dapagliflozin — now standard of care for diabetic CKD, with proven 30–40% reduction in CKD progression regardless of glucose control). Annual uACR testing is mandatory for all Indian diabetics — microalbuminuria is the first detectable sign of diabetic nephropathy, appearing years before creatinine rises.
Diabetic nephropathy: 30–40% Indian new dialysis patients। Chronic hyperglycaemia → glomerulosclerosis → creatinine rise, eGFR fall। Slowing progression: HbA1c <7%, BP <130/80, ACE inhibitor/ARB (glomerular pressure कम, proteinuria कम), SGLT2 inhibitors (30–40% CKD progression reduction — now standard of care)। Annual uACR mandatory सभी Indian diabetics के लिए।Hypertension is the second most common cause of CKD in India — responsible for approximately 20–25% of CKD cases. Sustained elevated blood pressure damages small renal arteries (arteriosclerosis of afferent arterioles) → reduced blood supply to nephrons → ischaemic nephropathy → progressive nephron loss → rising creatinine and falling eGFR. The challenge in India: hypertension is extremely common (estimated 30% of adults), poorly controlled (only 15% of hypertensive Indians have controlled BP), and silently damages the kidneys for years before CKD is detected. Home blood pressure monitoring is critical — clinic BP measurements miss the early morning hypertensive surges and nocturnal non-dipping patterns that are particularly damaging to kidneys. Target BP in CKD: below 130/80 mmHg (even lower — below 120/80 — if proteinuria is significant). First-line antihypertensives in CKD with proteinuria: ACE inhibitor (enalapril, ramipril, lisinopril) or ARB (losartan, telmisartan, olmesartan) — both reduce proteinuria and slow CKD progression independently of BP-lowering effect.
Hypertensive nephropathy: 20–25% Indian CKD। BP arteriosclerosis → nephron loss → eGFR fall। India में hypertension 30% adults लेकिन only 15% controlled। Home BP monitoring critical — early morning surges + nocturnal non-dipping kidneys damage। CKD target BP: <130/80 (proteinuria के साथ <120/80)। First-line: ACE inhibitor या ARB — proteinuria कम, CKD progression slow।Acute Kidney Injury (AKI) — a sudden, rapid decline in kidney function over hours to days — is distinct from CKD and is potentially reversible if the cause is identified and corrected promptly. AKI is extremely common in Indian hospitals. Common causes in India: severe dehydration and volume depletion (very common in summer months — severe diarrhoea, vomiting, heatstroke, inadequate fluid intake); NSAIDs (ibuprofen, diclofenac, naproxen — extremely widely self-prescribed in India, particularly for body aches and joint pain; these block prostaglandin-mediated renal vasodilation, reducing glomerular filtration acutely, especially in already-compromised kidneys); aminoglycoside antibiotics (gentamicin, amikacin — commonly used in Indian hospitals for sepsis, directly nephrotoxic); radiocontrast agents (used in CT scans and angiograms — contrast-induced nephropathy, a particular risk in pre-existing CKD); and sepsis (the most common cause of AKI in Indian ICUs). AKI presents as rapidly rising creatinine over 48–72 hours. Management: identify and treat the cause, correct volume depletion, stop nephrotoxic drugs, and monitor with serial creatinine every 24–48 hours until recovery.
AKI: sudden creatinine rise over hours-to-days — potentially reversible। India में common causes: severe dehydration (summer diarrhoea/vomiting), NSAIDs (ibuprofen/diclofenac — self-prescribed, prostaglandin block → renal flow reduce), aminoglycosides (gentamicin — nephrotoxic), radiocontrast (CT/angio में — contrast nephropathy), sepsis (ICU में most common)। Management: cause treat, volume restore, nephrotoxics stop, serial creatinine 24–48 hourly।India has a significant burden of non-diabetic, non-hypertensive CKD from various glomerular diseases: IgA nephropathy (the most common primary glomerulonephritis globally — particularly common in young Indian men, presenting with haematuria after respiratory infections, and progressively causing CKD); focal segmental glomerulosclerosis (FSGS); membranous nephropathy; and lupus nephritis (in young Indian women with systemic lupus erythematosus — see our ANA guide). Other important Indian CKD causes: obstructive uropathy (kidney stones causing bilateral ureteral obstruction — common given India's high nephrolithiasis prevalence); CKD of uncertain aetiology (CKDu — a major problem in agricultural communities in Andhra Pradesh, Telangana, and parts of Tamil Nadu, likely related to heat stress, dehydration, and pesticide exposure); hereditary nephropathies (polycystic kidney disease, Alport syndrome); and myeloma kidney.
Other CKD causes in India: IgA nephropathy (most common primary GN — young Indian men, haematuria after respiratory infections)। FSGS, membranous nephropathy, lupus nephritis (young Indian women)। Obstructive uropathy (kidney stones — bilateral obstruction)। CKDu (agricultural communities — AP, Telangana, Tamil Nadu — heat stress, pesticides)। Hereditary: PKD, Alport। Myeloma kidney।How to Protect Your Kidneys
- Hydration — 2.0–2.5 litres of water per day: Adequate hydration maintains renal perfusion, prevents urinary concentration that forms crystals and casts, and reduces the risk of kidney stone formation. In India's hot climate, summer fluid losses through sweat can be 1.5–2 litres above baseline — inadequate replacement causes subclinical dehydration that chronically stresses the kidneys. The target: urine should be pale yellow, not concentrated yellow or orange. People in physically demanding occupations (farmers, labourers, construction workers) in hot climates need 3–4+ litres/day.
- Blood pressure control below 130/80 mmHg: The single most effective intervention for slowing CKD progression regardless of cause. Every 10 mmHg reduction in systolic BP reduces kidney disease progression risk by approximately 20–25%. Home BP monitoring is essential — clinic measurements alone miss the nocturnal and morning hypertensive surges most damaging to kidneys.
- Glycaemic control (HbA1c below 7%): For diabetics, every 1% reduction in HbA1c reduces diabetic nephropathy progression risk by approximately 35%. SGLT2 inhibitors (empagliflozin, dapagliflozin) have dual benefit — glucose lowering AND direct kidney-protective haemodynamic effects.
- Avoid NSAIDs — the most common avoidable kidney toxin in India: Ibuprofen, diclofenac, and naproxen are among the most widely self-prescribed medications in India (available over the counter, taken for back pain, arthritis, and fever). These drugs inhibit prostaglandin synthesis → reduce afferent arteriolar vasodilation → reduce glomerular filtration acutely. In a person with underlying CKD, even a single course of NSAIDs can precipitate acute-on-chronic kidney failure. Paracetamol (acetaminophen) is the safe alternative for pain management in CKD.
- Protein intake — moderation in CKD, adequacy in healthy kidneys: For healthy individuals, normal protein intake (0.8–1.2 g/kg/day) does not harm the kidneys. For patients with CKD G3 and above, moderate protein restriction (0.6–0.8 g/kg/day) reduces the filtration burden on remaining nephrons and slows CKD progression — discuss with a nephrologist and renal dietitian.
- Annual KFT + uACR screening — particularly in diabetics, hypertensives, and those above 40: Early detection while eGFR is still above 60 allows interventions that can maintain kidney function for decades. By the time symptoms appear, eGFR is often already below 30.
Test Preparation Checklist / टेस्ट की तैयारी
KFT preparation is important for obtaining accurate, standardised results — particularly for creatinine and urea, which can be transiently affected by diet, exercise, and hydration status:
KFT preparation accurate, standardised results के लिए ज़रूरी है — especially creatinine और urea के लिए जो diet, exercise, और hydration से transiently affect होते हैं।-
Fast for 8–12 hours before KFT — water is permitted and encouraged. Fasting is required for KFT because: (1) urea rises after a high-protein meal (dietary creatine → creatinine); (2) blood glucose testing is often combined with KFT in diabetic monitoring panels, requiring fasting. Water intake before and during fasting is not only permitted — it is actively encouraged, because adequate hydration ensures the kidneys are not acutely stressed at the time of testing (dehydration transiently raises creatinine). Drink 1–2 glasses of plain water on waking before the blood draw.
KFT से पहले 8–12 hours fasting। Water: न only permitted — actively encouraged। Dehydration creatinine transiently बढ़ाता है। Blood draw से पहले सुबह 1–2 glasses plain water पियें। Urea high-protein meal के बाद rise होता है। -
Avoid red meat and high-protein meals for 24 hours before the test. Dietary creatine (abundant in red meat, mutton, chicken) is converted to creatinine in the body — a large meat meal can raise serum creatinine by 0.1–0.3 mg/dL above baseline for 6–24 hours. For the most accurate baseline creatinine, avoid red meat, fish, and high-protein meals the day before testing. Normal vegetarian or low-protein meals (dal, rice, vegetables) on the evening before testing is fine.
Test से 24 hours पहले red meat, mutton, fish, high-protein meal avoid। Dietary creatine → creatinine conversion — serum creatinine 0.1–0.3 mg/dL temporarily बढ़ता है। Previous evening: normal vegetarian meal (dal, rice, sabzi) ठीक है। -
Avoid strenuous exercise for 24–48 hours before the test. Intense exercise (running, weight training, heavy manual labour) causes muscle breakdown → transient creatinine rise. This can produce an apparent creatinine elevation (e.g., 1.4 mg/dL instead of baseline 1.1 mg/dL) that resolves on repeat testing after 48 hours of rest. For accurate KFT, come for the test after a rest day or at most after light activity (gentle walking). Normal daily activities do not require restriction.
Test से 24–48 hours पहले strenuous exercise avoid (running, weight training, heavy labour)। Intense exercise → muscle breakdown → creatinine transient rise। Rest day के बाद test accurate। Normal daily activities — restriction नहीं। -
Disclose all medications — particularly NSAIDs, aminoglycosides, contrast agents, and ACE inhibitors/ARBs. NSAIDs (ibuprofen, diclofenac) reduce renal blood flow and can acutely raise creatinine — if possible, withhold before elective KFT testing (discuss with your doctor). ACE inhibitors and ARBs typically raise serum creatinine by 10–15% when first started or dose-increased — this is expected and generally acceptable (up to 25–30% rise without needing to stop). An acute creatinine rise above 30–40% after starting an ACE inhibitor or ARB may indicate bilateral renal artery stenosis and requires urgent investigation.
Medications disclose करें: NSAIDs (ibuprofen, diclofenac) → renal blood flow कम → creatinine raise। Elective KFT से पहले withhold (doctor से discuss)। ACE inhibitors/ARBs: 10–15% creatinine rise expected (acceptable up to 25–30%)। >30–40% rise = bilateral renal artery stenosis suspect → urgent। -
For serial KFT monitoring (CKD patients), always use the same NABL-accredited laboratory. Creatinine assay values can vary by 0.1–0.2 mg/dL between different labs due to platform differences — this is small in absolute terms but clinically significant when monitoring whether eGFR is stable or declining. An apparent fall in eGFR from 65 to 55 between two labs could represent a true 10-point decline or simply an inter-lab creatinine variation. For CKD monitoring, always use the same NABL lab, and test at the same time of day (morning fasting), under the same dietary and hydration conditions.
CKD serial monitoring: same NABL lab हमेशा। 0.1–0.2 mg/dL inter-lab creatinine variation → eGFR 5–10 point apparent change। True CKD progression vs assay difference = important distinction। Same lab + same time + same dietary conditions → meaningful trend।
✅ Book Comprehensive KFT Panel — Home Collection Available
For comprehensive kidney assessment, book the complete KFT panel (Creatinine + Urea + eGFR + Uric Acid + Electrolytes + Calcium + Urine Routine) alongside uACR (spot urine albumin:creatinine ratio — the earliest kidney damage marker). 8–12 hours fasting, adequate hydration, and no strenuous exercise in 24–48 hours:
Affiliate link: I may earn a small commission at no extra cost to you. KFT tests are available at government hospitals and PMJAY-empanelled facilities across India. Always have KFT results interpreted by a qualified nephrologist or physician alongside blood pressure measurements, HbA1c (in diabetics), urine protein, medication history, and clinical symptoms. Never adjust kidney medications (ACE inhibitors, ARBs, SGLT2 inhibitors) without consulting your nephrologist.
KFT सरकारी hospitals में available। Complete panel book करें (Creatinine + eGFR + Urea + Uric Acid + Electrolytes + uACR)। Fasting + hydration + no strenuous exercise। Same NABL lab serial tests। Nephrologist से BP, HbA1c, urine protein, medications के साथ interpret करवाएं।Kidney Health — Two Daily Management Tools
Two products for the daily management of the two most critical kidney-protective habits — blood pressure monitoring (hypertension is the second leading cause of CKD in India, and home BP monitoring is the cornerstone of adequate BP control that clinic measurements alone cannot provide) and consistent hydration tracking (dehydration is the most common acute kidney stressor and is preventable with a water intake reminder system). These tools support kidney protection habits alongside medical management — they do not replace nephrology care, prescribed medications, or regular KFT monitoring. Patients with established CKD should follow their nephrologist's specific dietary and fluid intake recommendations, which may differ from general population guidelines.
Blood pressure control is the single most effective intervention for preventing CKD progression — regardless of whether the cause is diabetes, hypertension, or glomerulonephritis. The target in CKD is below 130/80 mmHg (below 120/80 if significant proteinuria). Achieving and maintaining this target is impossible without regular home blood pressure monitoring, for two clinical reasons that are particularly relevant in India. First, white coat hypertension: approximately 20–30% of Indian patients have higher BP in the clinic than at home — basing medication decisions on clinic-only readings in these patients leads to over-treatment. Second, and more dangerously, masked hypertension and nocturnal non-dipping: approximately 15–20% of patients have normal clinic BP but elevated home (especially morning) BP — these patients are undertreated and their kidneys are being silently damaged despite apparently controlled clinic readings. The morning BP surge (the sharp rise in BP in the first 1–2 hours after waking) is the most kidney-damaging BP pattern — and is only detectable through home monitoring taken within 15 minutes of waking, before breakfast and medications. The standard protocol for CKD patients: measure BP twice in the morning (before medications, 2 minutes apart) and twice in the evening × 7 days before each nephrology appointment — the average of these 14 readings provides the most accurate clinical BP data for treatment decisions. The OxiPro BP1 is clinically validated (CE certified, MHRA registered), uses an oscillometric upper-arm cuff method, provides an automatic average of the last 3 readings, has a 2-user memory function, and a WHO classification indicator for immediate result interpretation — ideal for the consistent, twice-daily home monitoring protocol recommended for CKD and hypertension management.
BP control = most effective CKD progression prevention। Target: <130/80 (<120/80 with significant proteinuria)। Home monitoring क्यों critical: White coat hypertension (20–30% patients clinic में higher BP)। Masked hypertension + morning surge (most kidney-damaging) = only home monitoring detect करता है। Protocol: morning (medications से पहले, 2 readings, 2 min apart) + evening × 7 days। 14 readings average = most accurate clinical data। OxiPro BP1: CE + MHRA certified, upper-arm oscillometric, last 3 readings average, 2-user memory, WHO indicator। View on Amazon IndiaAffiliate link — small commission at no extra cost.
Adequate daily hydration is one of the most undervalued kidney-protective behaviours in Indian clinical practice — and one of the easiest to implement with the right reminder system. The kidneys process approximately 180 litres of filtrate per day, concentrating it to produce 1.5–2.0 litres of urine. When fluid intake is inadequate, urine becomes highly concentrated — this concentrated urine promotes crystal formation (kidney stones), increases urinary tract infection risk, and chronically exposes tubular cells to high concentrations of waste products and potential toxins. In India's hot and humid climate (ambient temperatures above 38°C during summer months in much of the country), insensible fluid losses through sweat, respiration, and skin can reach 1.5–2.0 litres above baseline, meaning the minimum adequate fluid intake for kidney protection in summer may be 3.0–3.5 litres for physically active individuals. Despite this, many Indian adults — particularly older adults, those with sedentary desk jobs, and people with reduced thirst perception — chronically consume only 1.0–1.5 litres daily, subjecting their kidneys to chronic mild dehydration stress. A water bottle with time markers (showing target intake milestones throughout the day — e.g., "by 10 AM: 500 mL," "by 1 PM: 1000 mL") removes the common barrier of forgetting to drink — it turns adequate hydration from an intention into a visible, trackable habit. The SOLARA unbreakable water bottle (BPA-free, 1 litre capacity, with motivational time markers and a sipper cap for easy use throughout the day) provides a durable, practical hydration tracking solution appropriate for both home and workplace use. Important for CKD patients: Fluid intake recommendations in advanced CKD (particularly CKD G4–G5 and dialysis patients) are often restricted — not unlimited. CKD patients must follow their nephrologist's specific daily fluid allowance rather than general population hydration guidelines. For CKD patients on dialysis, excess fluid intake causes dangerous fluid overload. Always check with your nephrologist about the appropriate fluid target for your specific CKD stage.
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Related Tests / संबंधित जांचें
These tests are commonly ordered alongside KFT for complete kidney and metabolic health evaluation:
KFT के साथ ये जांचें complete kidney और metabolic evaluation में order होती हैं:Frequently Asked Questions / अक्सर पूछे जाने वाले सवाल
It depends critically on who you are — specifically your age, sex, and muscle mass. A creatinine of 1.4 mg/dL represents very different kidney function in different people: in a 25-year-old male bodybuilder with high muscle mass, 1.4 mg/dL may correspond to an eGFR of 75–80 mL/min/1.73m² — mildly reduced but not alarming. In a 70-year-old woman with low muscle mass, the same creatinine of 1.4 mg/dL may correspond to an eGFR of only 35–40 mL/min/1.73m² — CKD Stage G3b, with significant kidney impairment requiring nephrology care. This is why serum creatinine alone should never be the basis for clinical decisions — the eGFR, calculated from creatinine alongside age and sex, is the parameter that reveals true kidney functional capacity. If your lab report shows creatinine 1.4 mg/dL, look for the eGFR on the same report — most NABL labs calculate and report it automatically. If not, ask your doctor to calculate it, or share your creatinine, age, and sex with your nephrologist for an accurate eGFR estimate.
उत्तर: Depends on age, sex, muscle mass। 25-year-old male bodybuilder: creatinine 1.4 = eGFR 75–80 (mildly reduced)। 70-year-old woman: creatinine 1.4 = eGFR 35–40 (CKD G3b — significant impairment)। Creatinine alone clinical decisions की basis नहीं। eGFR (creatinine + age + sex से calculate) = true kidney capacity। Lab report में eGFR खोजें — या doctor से calculate करवाएं।KFT (Kidney Function Test) and RFT (Renal Function Test) refer to exactly the same panel of blood tests — "renal" and "kidney" are synonyms (renal is the Latin/medical term; kidney is the common English and Hindi equivalent — गुर्दा). Different Indian labs use different names for the same test set. Both KFT and RFT include Serum Creatinine, Blood Urea, eGFR (calculated), and often Serum Uric Acid, Electrolytes, Calcium, and Urine Routine. Some labs also include the terms "kidney profile" or "renal profile" — these are all the same panel. When your doctor writes "KFT" or "RFT" on a prescription or referral, either term should be interpreted the same way by the lab and the same tests will be performed.
उत्तर: KFT = RFT = exactly same panel। "Renal" = Latin/medical term; "Kidney" = common term। Different labs, same tests। Both include: Serum Creatinine, Blood Urea, eGFR, Uric Acid, Electrolytes, Calcium, Urine Routine। "Kidney profile" / "Renal profile" = same thing। Doctor का prescription KFT हो या RFT — lab same tests perform करती है।Yes — and this is one of the most important roles of the KFT. The kidneys have significant reserve capacity: symptoms of kidney failure (fatigue, swelling, reduced urine output, breathlessness, nausea, confusion) typically appear only when 60–70% of total kidney function is already lost. By this stage, creatinine is often 3–5 mg/dL and eGFR below 25–30. However, KFT detects kidney damage at a much earlier stage: eGFR below 60 (CKD G3), which corresponds to approximately 50% function loss, often has no symptoms at all. Even earlier detection comes from the uACR (urine albumin:creatinine ratio) — microalbuminuria (uACR 30–300 mg/g) is detectable years before creatinine begins to rise, when the glomerular filter first starts to leak small amounts of albumin. This is why annual KFT + uACR screening is recommended for anyone with diabetes, hypertension, or a family history of kidney disease — catching CKD at G1–G2 with normal creatinine but proteinuria allows interventions that can preserve kidney function for decades.
उत्तर: हाँ — symptoms 60–70% function loss पर (creatinine 3–5, eGFR <25–30)। KFT much earlier detect करता है: eGFR <60 (CKD G3, ~50% function loss) = often no symptoms। uACR even earlier: microalbuminuria (30–300 mg/g) creatinine rise से years पहले detectable। Annual KFT + uACR: diabetes, hypertension, family history वाले। G1–G2 पर catch = decades तक kidney function preserve possible।NSAIDs (Non-Steroidal Anti-Inflammatory Drugs — ibuprofen, diclofenac, naproxen, aspirin in high doses, and COX-2 inhibitors like etoricoxib) reduce kidney blood flow by inhibiting prostaglandin synthesis. Prostaglandins are local hormones that maintain afferent arteriolar vasodilation — the mechanism by which the kidneys ensure adequate blood supply to their filtration units even when systemic blood pressure is low. When prostaglandins are blocked by NSAIDs, afferent arterioles constrict → glomerular perfusion pressure drops → GFR falls acutely. In a healthy person with normal kidney function and no other stress, this acute GFR reduction is usually temporary and recovers when the NSAID is stopped. However, in people with pre-existing CKD, diabetes, hypertension, the elderly, those with heart failure, or anyone who is dehydrated — the kidneys are already working near capacity, and the additional prostaglandin-blocking effect of NSAIDs can precipitate acute-on-chronic kidney failure, sometimes requiring emergency dialysis. Even in people with apparently normal KFT, regular or frequent NSAID use (daily or near-daily for months) causes chronic tubulointerstitial nephritis — a progressive and often irreversible form of kidney damage. The safe alternatives: paracetamol (acetaminophen) for mild-to-moderate pain; opioids (under physician guidance) for severe pain; tramadol in controlled doses. If NSAIDs are absolutely necessary, use the lowest effective dose for the shortest time, ensure adequate hydration, and never combine with ACE inhibitors, ARBs, or diuretics (the "triple whammy" combination that dramatically increases acute kidney injury risk).
उत्तर: NSAIDs (ibuprofen, diclofenac, etoricoxib) prostaglandin synthesis inhibit करते हैं → afferent arterioles constrict → GFR acutely fall। Healthy person में temporary। CKD, diabetes, hypertension, elderly, dehydrated, heart failure में → acute-on-chronic kidney failure (emergency dialysis possible)। Regular NSAID use = chronic tubulointerstitial nephritis (progressive, often irreversible)। Safe alternatives: paracetamol। Absolutely necessary NSAIDs: lowest dose + shortest time + adequate hydration + ACE inhibitor/ARB/diuretic के साथ NEVER (triple whammy = high AKI risk)।An eGFR of 58 mL/min/1.73m² corresponds to CKD Stage G3a — mildly to moderately reduced kidney function. Whether this qualifies as CKD requires confirmation: CKD is defined as evidence of kidney damage (abnormal structure or function) persisting for more than 3 months. A single eGFR of 58 measured once does not diagnose CKD — it needs to be confirmed on a repeat test at least 3 months later. If the eGFR remains below 60 on two measurements more than 3 months apart, CKD G3a is confirmed. No — dialysis is not needed at this stage. Dialysis is typically considered when eGFR falls below 10–15 mL/min/1.73m² with uraemic symptoms. At eGFR 58, the priorities are: identify the underlying cause (diabetes, hypertension, kidney disease?), control BP below 130/80, achieve HbA1c below 7% if diabetic, start ACE inhibitor or ARB if proteinuria is present, adjust medications that require dose reduction in CKD, monitor with 6-monthly KFT, and see a nephrologist. Most people with eGFR 58 who manage their risk factors well can maintain stable kidney function for many years without progressing to dialysis.
उत्तर: eGFR 58 = CKD G3a (mildly-moderately reduced)। CKD diagnosis: 3 months से more damage evidence। Single measurement = CKD नहीं — 3+ months बाद repeat। दोनों <60 → CKD G3a confirmed। Dialysis: eGFR <10–15 + uraemic symptoms पर। eGFR 58 पर priorities: underlying cause identify, BP <130/80, HbA1c <7%, ACE/ARB if proteinuria, medication dose adjust, 6-monthly KFT, nephrologist। Risk factors well-managed = many years without dialysis।- KDIGO 2024 CKD Guidelines: KDIGO Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease
- Indian Society of Nephrology (ISN-India): ISN-India — Indian Nephrology Guidelines and CKD Resources
- MedlinePlus (NIH): Creatinine Test — Patient Information
⚠️ Medical Disclaimer / चिकित्सा अस्वीकरण
This article is for educational purposes only. KFT results must be interpreted by a qualified nephrologist or physician alongside blood pressure measurements, HbA1c, urine protein/uACR, medication history, clinical symptoms, and imaging findings. A single elevated creatinine does not diagnose CKD — confirmation on repeat testing after 3 months is required. Never adjust kidney medications (ACE inhibitors, ARBs, SGLT2 inhibitors, diuretics) without consulting your nephrologist. Hyperkalaemia (serum potassium above 6.0 mEq/L) is a medical emergency — seek immediate care. Fluid restriction in advanced CKD (G4–G5 and dialysis) is often medically necessary — follow your nephrologist's specific fluid guidance rather than general hydration recommendations.
यह लेख केवल शैक्षिक उद्देश्यों के लिए है। KFT को nephrologist से BP, HbA1c, urine protein, medications के साथ interpret करवाएं। Single elevated creatinine = CKD नहीं — 3 months बाद confirm। Kidney medications (ACE/ARB, SGLT2, diuretics) alone adjust नहीं। Hyperkalaemia (K+ >6.0 mEq/L) = MEDICAL EMERGENCY। Advanced CKD में fluid restriction medically necessary — nephrologist की specific guidance follow करें।
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