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, eGFR & Uric Acid (India 2026)
किडनी फंक्शन टेस्ट (KFT): नॉर्मल रेंज, क्रिएटिनिन, eGFR और यूरिक एसिड की पूरी जानकारी
The Kidney Function Test (KFT) is one of the most important blood tests in India — ordered for routine checkups, diabetes monitoring, blood pressure follow-up, medication safety, and whenever a patient presents with swelling, fatigue, or changes in urination. Kidney disease is often called a "silent disease" because it produces no symptoms until 50–70% of kidney function is already lost. The KFT is the primary tool for detecting this damage early.
This guide explains every parameter in a KFT report in simple English and Hindi — what normal values are, what elevated creatinine or low eGFR means, and what to do if values are abnormal. For understanding how to read lab reports in general, see our beginner's guide to blood test reports.
KFT भारत में सबसे महत्वपूर्ण ब्लड टेस्ट में से एक है। किडनी की बीमारी को "मूक रोग" कहा जाता है क्योंकि 50–70% किडनी कार्य खोने तक कोई लक्षण नहीं होते। KFT इस नुकसान को जल्दी पकड़ने का प्राथमिक उपकरण है।
What Is a KFT? / KFT क्या होता है?
A Kidney Function Test is a panel of blood tests that measure waste products which healthy kidneys filter from the blood into urine. When kidneys are damaged or diseased, these waste products accumulate in the blood — and the KFT detects this accumulation. The test is also called RFT (Renal Function Test) or simply "Renal Profile" in some Indian labs.
KFT ब्लड टेस्ट का एक पैनल है जो उन अपशिष्ट पदार्थों को मापता है जिन्हें स्वस्थ किडनी रक्त से यूरिन में फिल्टर करती है। जब किडनी क्षतिग्रस्त होती है, ये अपशिष्ट पदार्थ रक्त में जमा हो जाते हैं — और KFT इसी जमाव का पता लगाता है।Warning Signs: When to Book a KFT / चेतावनी के संकेत
Puffiness around eyes in the morning, or swelling in feet and ankles later in the day — especially if pressing the swollen area leaves a pit (pitting oedema). In kidney disease, this occurs because the kidneys cannot regulate fluid balance properly.
Persistent foam in urine indicates protein leakage through the kidneys (proteinuria) — a sign of kidney filter damage. Dark or tea-coloured urine may indicate blood in urine (haematuria) or kidney-related jaundice. Both warrant immediate investigation.
Reduced urine output (oliguria), waking up multiple times at night to urinate (nocturia), or complete absence of urine (anuria). Also relevant: pain or burning during urination if accompanied by other kidney symptoms. These are often the first noticed signs of kidney dysfunction in India.
The two leading causes of CKD in India — together responsible for two-thirds of all kidney failure cases. Annual KFT is mandatory for all diabetic and hypertensive patients regardless of symptoms. Also: patients on long-term NSAID painkillers (ibuprofen, diclofenac), aminoglycosides, or contrast dye procedures.
KFT Normal Ranges & Parameters Explained / सामान्य सीमा और पैरामीटर
1. Serum Creatinine / सीरम क्रिएटिनिन
Creatinine is a waste product of muscle metabolism — produced at a constant rate by muscles and filtered entirely by healthy kidneys into the urine. Because production is constant, any accumulation in the blood directly reflects impaired kidney filtration. It is the single most important and reliable kidney marker on the KFT panel.
क्रिएटिनिन मांसपेशी चयापचय का अपशिष्ट उत्पाद है — मांसपेशियों द्वारा स्थिर दर से उत्पादित और स्वस्थ किडनी द्वारा पूरी तरह यूरिन में फिल्टर किया जाता है। रक्त में इसकी वृद्धि सीधे बिगड़ी किडनी निस्पंदन को दर्शाती है।| Creatinine Level | Men / पुरुष | Women / महिलाएं | Significance |
|---|---|---|---|
| Normal | 0.7–1.3 mg/dL | 0.6–1.1 mg/dL | Normal kidney filtration |
| Mildly elevated | 1.3–2.0 mg/dL | 1.1–1.6 mg/dL | Early dysfunction — check eGFR, recheck in 2–4 weeks |
| Significantly elevated | 2.0–5.0 mg/dL | 1.6–4.0 mg/dL | Significant CKD — nephrologist referral needed |
| Very high | > 5.0 mg/dL | > 4.0 mg/dL | Advanced kidney failure — urgent specialist care |
2. eGFR — The True Measure of Kidney Function / किडनी कार्य का असली माप
eGFR (estimated Glomerular Filtration Rate) is calculated from your creatinine value, age, sex, and in some formulae, race. It estimates how many millilitres of blood your kidneys are filtering per minute — and is the most clinically important value on the KFT for detecting and staging CKD. As per NIDDK, an eGFR below 60 for more than 3 months confirms CKD regardless of other findings.
eGFR आपके क्रिएटिनिन मान, उम्र और लिंग से गणना की जाती है। यह अनुमान लगाती है कि आपकी किडनी प्रति मिनट कितने मिलीलीटर रक्त फिल्टर कर रही है — CKD का पता लगाने और स्तर निर्धारित करने के लिए सबसे महत्वपूर्ण मान।| eGFR (mL/min/1.73m²) | CKD Stage | Kidney function remaining | Action needed |
|---|---|---|---|
| ≥ 90 | G1 — Normal or high | 90–100% | Normal. Monitor annually if diabetes/hypertension present. |
| 60–89 | G2 — Mildly decreased | 60–89% | Mild reduction. Manage underlying cause (diabetes, BP). Recheck in 3–6 months. Note for older adults (above 65–70 years): eGFR naturally declines with age — a value of 60–89 may be age-related rather than disease in an otherwise healthy elderly patient with no protein in urine. |
| 45–59 | G3a — Mild-moderate decrease | 45–59% | CKD confirmed. Nephrology referral recommended. Control BP, blood sugar, avoid NSAIDs. |
| 30–44 | G3b — Moderate-severe decrease | 30–44% | CKD. Nephrologist follow-up essential. Begin CKD diet, manage anaemia and bone health. |
| 15–29 | G4 — Severely decreased | 15–29% | Advanced CKD. Plan for renal replacement therapy (dialysis/transplant). Urgent nephrologist care. |
| < 15 | G5 — Kidney failure | < 15% | End-stage kidney disease. Dialysis or kidney transplant usually required. |
3. Blood Urea / ब्लड यूरिया
Urea is produced in the liver from protein breakdown and is normally filtered by the kidneys. High blood urea (azotaemia) combined with high creatinine strongly confirms kidney dysfunction. However, urea is less specific than creatinine — it also rises with high protein diet, dehydration, upper GI bleeding, steroid use, and fever. The BUN/Creatinine ratio (Urea/Creatinine × 0.357) helps distinguish pre-renal (dehydration) from intrinsic kidney causes — a ratio above 20 suggests pre-renal azotaemia.
यूरिया लिवर में प्रोटीन के टूटने से बनती है और किडनी द्वारा फिल्टर होती है। उच्च यूरिया + उच्च क्रिएटिनिन = किडनी की शिथिलता। लेकिन यूरिया उच्च-प्रोटीन आहार, निर्जलीकरण और बुखार में भी बढ़ती है। BUN/Creatinine अनुपात 20 से ऊपर = प्री-रीनल एज़ोटेमिया (मुख्यतः निर्जलीकरण)।4. Uric Acid & Gout / यूरिक एसिड और गाउट
Uric acid is the end product of purine breakdown (from red meat, organ meats, seafood, beer, and fructose). Healthy kidneys excrete most uric acid in urine. Elevated uric acid — hyperuricaemia — causes gout (acute joint inflammation, most commonly the big toe) and kidney stones. In India, hyperuricaemia is increasingly common due to dietary patterns and is closely associated with metabolic syndrome, hypertension, and chronic kidney disease. The National Kidney Foundation recognises uric acid as an independent CKD risk factor.
यूरिक एसिड प्यूरीन के टूटने का अंतिम उत्पाद है (लाल मांस, अंग मांस, समुद्री भोजन, बीयर, फ्रुक्टोज से)। उच्च यूरिक एसिड — हाइपरयूरिसेमिया — गाउट (सबसे अधिक बड़े पैर की उंगली में तीव्र जोड़ों की सूजन) और गुर्दे की पथरी का कारण बनता है।
Complete KFT Normal Reference Table / सम्पूर्ण KFT सामान्य सीमा
*Reference ranges vary slightly between labs and assay methods. Creatinine in particular can read 5–10% higher on the older Jaffe method (used in many Indian labs) compared to the more accurate enzymatic method. eGFR naturally declines with age — above 60 mL/min with no urine protein may be normal for patients above 70. Always compare your result against the reference range printed on your specific report.
*संदर्भ सीमाएँ लैब के अनुसार थोड़ी भिन्न होती हैं। अपनी रिपोर्ट की सीमा हमेशा देखें।| Parameter / पैरामीटर | Normal Range (Men) | Normal Range (Women) | Unit |
|---|---|---|---|
| Serum Creatinine सीरम क्रिएटिनिन | 0.7 – 1.3 | 0.6 – 1.1 | mg/dL |
| Blood Urea ब्लड यूरिया | 15 – 40 | mg/dL | |
| BUN (Blood Urea Nitrogen) | 7 – 20 | mg/dL | |
| eGFR | ≥ 90 = Normal; < 60 = CKD | mL/min/1.73m² | |
| Uric Acid यूरिक एसिड | 3.4 – 7.0 | 2.4 – 6.0 | mg/dL |
| Sodium (Na) सोडियम | 136 – 145 | mEq/L | |
| Potassium (K) पोटेशियम | 3.5 – 5.1 | mEq/L | |
| Chloride (Cl) क्लोराइड | 98 – 107 | mEq/L | |
Causes of High Creatinine / क्रिएटिनिन बढ़ने के कारण
The leading cause of CKD and dialysis in India. Chronic high blood sugar damages the kidney's filtration membrane over 10–20 years — initially detectable only by microalbumin urine test, later by rising creatinine and falling eGFR. Every diabetic patient in India should have annual KFT and urine microalbumin checked simultaneously.
Chronic uncontrolled hypertension damages the small blood vessels supplying the kidneys — causing progressive nephrosclerosis and rising creatinine. The second leading cause of CKD in India after diabetes. Tight BP control (target below 130/80 mmHg in CKD) is the most effective intervention to slow progression.
The most common cause of a mildly elevated creatinine in routine Indian health checkups — particularly in summer. Reduced blood flow to kidneys causes creatinine to accumulate temporarily. Recheck after 48–72 hours of adequate hydration — if creatinine normalises, no kidney disease was present. This is why always recheck before concluding CKD.
Ibuprofen, diclofenac, and ketorolac are among the most commonly over-the-counter used medicines in India — and chronic use or overuse in patients with pre-existing kidney risk (diabetes, age, dehydration) can cause acute kidney injury. Contrast dye used in CT scans and cardiac catheterisation is another important cause of acute creatinine rise in Indian hospitals.
What to Do If KFT Is Abnormal / असामान्य KFT आने पर क्या करें?
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Do not panic at a single mildly elevated creatinine — recheck after hydration
Before any further investigation, drink adequate water for 48 hours and avoid vigorous exercise, NSAIDs, and large amounts of protein. Then recheck creatinine. If it normalises, dehydration was the cause. If it remains elevated, proceed with investigation.
48 घंटे पर्याप्त पानी पिएं, NSAIDs और तेज़ व्यायाम से बचें, फिर क्रिएटिनिन दोहराएं। यदि सामान्य हो जाए — निर्जलीकरण कारण था। यदि बना रहे — जांच आगे बढ़ाएं। -
Check urine microalbumin — it detects kidney damage before creatinine rises
In diabetic and hypertensive patients, microalbumin (urine albumin-creatinine ratio / ACR) becomes abnormal years before creatinine rises. A normal creatinine does not mean the kidneys are undamaged in a long-standing diabetic — always check ACR alongside KFT annually. ACR above 30 mg/g with any two of three samples = kidney damage confirmed.
मधुमेह और उच्च रक्तचाप के रोगियों में, माइक्रोएल्बुमिन क्रिएटिनिन बढ़ने से वर्षों पहले असामान्य हो जाता है। सामान्य क्रिएटिनिन का मतलब किडनी का अक्षत होना नहीं है। -
See a nephrologist if eGFR is below 60 or creatinine is persistently above 1.5
A nephrologist (kidney specialist) can determine the cause, slow progression, manage complications (anaemia, bone disease, acidosis), adjust medication doses (many drugs need dose reduction in CKD), and plan for eventual renal replacement therapy if needed. Early referral at CKD G3 stage substantially improves long-term outcomes.
eGFR 60 से नीचे या लगातार क्रिएटिनिन 1.5 से ऊपर होने पर नेफ्रोलॉजिस्ट से मिलें। CKD G3 स्तर पर शीघ्र रेफरल दीर्घकालिक परिणामों में काफी सुधार करता है। -
Control blood pressure strictly — target below 130/80 in CKD patients
Blood pressure control is the single most effective intervention to slow CKD progression regardless of cause. ACE inhibitors or ARBs are the preferred medicines because they have kidney-protective effects beyond blood pressure control. Monitor potassium and creatinine within 2–4 weeks of starting these medicines.
रक्तचाप नियंत्रण किसी भी कारण से CKD की प्रगति को धीमा करने का सबसे प्रभावी हस्तक्षेप है। लक्ष्य: CKD रोगियों में 130/80 mmHg से कम। -
Dietary changes — reduce protein, sodium, potassium, and phosphorus in CKD
CKD diet in India: moderate protein restriction (0.6–0.8 g/kg/day for CKD G3+), low salt (less than 2g sodium per day — avoid papads, pickles, processed foods), potassium restriction in advanced CKD (reduce banana, tomato, potato, orange, coconut water), and phosphorus restriction (reduce dairy, nuts, cola drinks). Never start a strict CKD diet without dietitian guidance — the exact restrictions depend on the CKD stage and lab values.
CKD आहार: मध्यम प्रोटीन प्रतिबंध, कम नमक, उन्नत CKD में पोटेशियम प्रतिबंध (केला, टमाटर, आलू, नारियल पानी कम), फास्फोरस प्रतिबंध। आहार विशेषज्ञ के मार्गदर्शन के बिना सख्त CKD आहार शुरू न करें।
If your KFT shows elevated uric acid or mildly elevated creatinine and you want to support kidney health and nutritional status as part of your lifestyle — Moringa (Moringa oleifera) is one of the most nutrient-dense superfoods traditionally used in India and has been studied for its antioxidant properties. Here is a popular organic Moringa powder available on Amazon India:
Organic India Moringa Powder — 100g (A TATA Product)
Rich in essential amino acids, antioxidants, and micronutrients · Traditionally used in Ayurveda for nutritional support · Important: Supplements are not a substitute for medical advice or treatment. If you have advanced CKD (eGFR below 45), always consult your nephrologist before adding any supplement — potassium and phosphorus content must be evaluated for your CKD stage.
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Related Tests / संबंधित जांचें
These tests are commonly ordered alongside or after KFT for complete metabolic assessment:
KFT के साथ या बाद में ये जांचें पूर्ण चयापचय मूल्यांकन के लिए अक्सर करवाई जाती हैं:Frequently Asked Questions / अक्सर पूछे जाने वाले सवाल
A Kidney Function Test (KFT) is a group of blood tests that measure how well your kidneys are filtering waste products. It includes Serum Creatinine (the most important kidney marker), Blood Urea, eGFR (estimated filtration rate), Uric Acid, and electrolytes (Sodium, Potassium, Chloride). Together these values tell doctors whether kidneys are functioning normally, whether chronic kidney disease is present, and if so, at what stage.
उत्तर: KFT ब्लड टेस्ट का एक समूह है जो मापता है कि आपकी किडनी अपशिष्ट पदार्थों को कितनी अच्छी तरह फिल्टर कर रही है — सीरम क्रिएटिनिन, ब्लड यूरिया, eGFR, यूरिक एसिड और इलेक्ट्रोलाइट्स।Normal KFT values for Indian adults: Serum Creatinine — Men 0.7–1.3 mg/dL, Women 0.6–1.1 mg/dL; Blood Urea — 15–40 mg/dL; eGFR — above 90 mL/min/1.73m² is normal, below 60 for more than 3 months confirms CKD; Uric Acid — Men 3.4–7.0 mg/dL, Women 2.4–6.0 mg/dL; Sodium — 136–145 mEq/L; Potassium — 3.5–5.1 mEq/L. Ranges vary slightly between labs — always check the range on your specific report.
उत्तर: सीरम क्रिएटिनिन: पुरुष 0.7–1.3, महिला 0.6–1.1 mg/dL। ब्लड यूरिया: 15–40 mg/dL। eGFR: 90+ सामान्य, 60 से कम = CKD। यूरिक एसिड: पुरुष 3.4–7.0, महिला 2.4–6.0 mg/dL।No — and this is one of the most important reassurances for patients. Transient causes of elevated creatinine that have nothing to do with permanent kidney damage include: dehydration (by far the most common reason for mild elevation on routine checkups), vigorous exercise before the test (releases creatinine from muscle), high-protein diet, large muscle mass, certain medicines (NSAIDs, ACE inhibitors, contrast dye, aminoglycoside antibiotics), and fever or acute illness. Always recheck creatinine after 48–72 hours of good hydration before concluding kidney disease is present.
उत्तर: नहीं। अस्थायी कारण: निर्जलीकरण (सबसे आम), तेज व्यायाम, उच्च-प्रोटीन आहार, बड़ी मांसपेशी, NSAIDs, ACE inhibitors। 48–72 घंटे पर्याप्त पानी के बाद दोहराएं।Annual KFT is recommended for: all patients with diabetes (even if well-controlled — diabetic nephropathy is silent for years), all patients with hypertension, anyone on long-term NSAID painkillers (ibuprofen, diclofenac) or other nephrotoxic medicines, patients with recurrent kidney stones or urinary tract infections, and anyone above 50 with any metabolic risk factor. Immediately if symptoms are present: swelling, reduced urination, foamy urine, extreme fatigue, or vomiting without clear cause. As part of any hospital admission or surgery preparation.
उत्तर: वार्षिक: सभी मधुमेह और उच्च रक्तचाप रोगियों के लिए। लंबे समय से NSAIDs पर। गुर्दे की पथरी वाले। 50 वर्ष से अधिक किसी भी जोखिम कारक के साथ। तुरंत: सूजन, पेशाब कम, झागदार पेशाब, अत्यधिक थकान।Fasting is generally not required for KFT alone — creatinine, urea, electrolytes, and uric acid are not significantly affected by food intake. However, since KFT is almost always ordered as part of a full health panel that includes fasting blood sugar and lipid profile, a standard 8–12 hour overnight fast is the practical approach. A high-protein meal immediately before the test can mildly raise urea, so avoiding a very protein-heavy dinner the night before is reasonable.
उत्तर: KFT अकेले के लिए उपवास आवश्यक नहीं। लेकिन यह अक्सर फास्टिंग ब्लड शुगर और लिपिड प्रोफाइल के साथ होता है — 8–12 घंटे का उपवास व्यावहारिक दृष्टिकोण है।Yes — mild variation of 5–10% between labs is possible due to different analysers and calibration methods. This matters most for creatinine, where the Jaffe method (older, used in many Indian labs) gives slightly higher readings than the enzymatic method (newer, more accurate). Always compare your result against the reference range on your specific report. For serial monitoring of kidney function — particularly when tracking CKD progression — use the same laboratory each time to ensure meaningful trend analysis.
उत्तर: हां — विभिन्न विश्लेषकों के कारण 5–10% का अंतर संभव है। CKD की प्रगति की निगरानी के लिए हमेशा एक ही लैब का उपयोग करें।⚠️ Medical Disclaimer / चिकित्सा अस्वीकरण
This article is for educational purposes only. KFT values vary by laboratory and must be interpreted by a qualified doctor — ideally a nephrologist for patients with persistently abnormal values — in the context of your symptoms, blood pressure, blood sugar, urine protein, and medicines. Do not self-diagnose or change any medication based on this guide.
यह लेख केवल शैक्षिक उद्देश्यों के लिए है। KFT मान लैब के अनुसार भिन्न होते हैं और लक्षणों, रक्तचाप, ब्लड शुगर और दवाओं के संदर्भ में एक योग्य डॉक्टर द्वारा व्याख्या की जानी चाहिए।
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