Dengue NS1 Antigen & IgM/IgG Test Explained: Positive Result Meaning (India) | डेंगू टेस्ट गाइड: NS1 और एंटीबॉडी का मतलब

Dengue NS1 Antigen & IgM/IgG Antibody Test Explained: Positive Result Meaning, Platelet Count & Warning Signs (India 2026)

डेंगू टेस्ट गाइड: NS1 एंटीजन, IgM और IgG एंटीबॉडी का मतलब, प्लेटलेट काउंट और खतरे के संकेत

A plain-language guide for patients & families · भारतीय मरीज़ों के लिए सरल मार्गदर्शिका

High fever, severe headache behind the eyes, muscle and joint pain so severe it is called "breakbone fever," and a falling platelet count — dengue is one of India's most feared monsoon illnesses. India reports 100,000–300,000 confirmed dengue cases annually — with the true burden estimated at 10–30 times higher due to under-reporting. Understanding your dengue test report — NS1, IgM, IgG — and knowing which warning signs demand immediate hospital admission are potentially life-saving. This guide explains it all in plain English and Hindi.

For reading lab reports generally, see our beginner's guide. If your doctor also ordered a CBC (platelet count), see that guide too.

डेंगू भारत की सबसे भयावह मानसूनी बीमारियों में से एक है। NS1, IgM और IgG रिपोर्ट समझना और गंभीर डेंगू के चेतावनी संकेत जानना जीवन बचा सकता है।

 Table of Contents / विषय सूची

1. What Is Dengue? / डेंगू क्या है?
2. NS1 vs IgM vs IgG — When Each Test Is Positive
3. Reading Your Report — All Combinations Explained
4. Platelet Count in Dengue — What Numbers Mean
5. Severe Dengue Warning Signs — Go to Hospital Now
6. Dengue vs Malaria vs Chikungunya — Key Differences
7. Test Preparation Checklist
8. Frequently Asked Questions / FAQ

Image 1: Dengue diagnostic overview for India 2026. NS1 antigen is positive in the first 1–5 days of fever — the early detection window. IgM antibody rises from Day 4–5 and persists for weeks. IgG antibody appears in secondary infection (second dengue episode) from Day 1–2 and persists lifelong. Platelet count monitoring is the most critical home monitoring parameter — a count below 50,000/µL warrants hospital admission in most dengue protocols. The Aedes aegypti mosquito — the dengue vector — bites primarily during the day (dawn and dusk), distinguishing it from malaria vectors that bite at night.

10–30M estimated true annual dengue cases in India — reported cases are only the tip of the iceberg due to massive under-diagnosis and under-reporting in rural India.

Day 1–5 optimal window for NS1 antigen test — most accurate within the first 5 days of fever onset. NS1 becomes negative by Day 5–7. After Day 5, test IgM antibody instead.

<20,000 /µL platelet count = emergency — risk of spontaneous haemorrhage. Below 50,000 = hospital admission in most Indian dengue protocols. Daily platelet monitoring is the most important home management action.

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What Is Dengue? / डेंगू क्या है?

Dengue fever is caused by the Dengue virus (DENV) — an RNA virus of the family Flaviviridae with 4 serotypes: DENV-1, DENV-2, DENV-3, DENV-4. It is transmitted by the Aedes aegypti mosquito — a day-biting mosquito that breeds in clean stagnant water (stored water containers, flower pots, coolers, tyres). India is hyperendemic for dengue — all four serotypes circulate, with DENV-2 and DENV-3 responsible for the most severe outbreaks. The incubation period (mosquito bite to fever) is 4–10 days. Critically, re-infection with a different serotype causes dramatically more severe disease (Dengue Haemorrhagic Fever / Dengue Shock Syndrome) due to antibody-dependent enhancement (ADE) — one of the key reasons dengue in India is more dangerous than in first-time exposure populations.

डेंगू DENV वायरस (4 serotypes) से होता है। वाहक: Aedes aegypti मच्छर — दिन में काटता है। भारत में सभी 4 serotypes घूमते हैं। दूसरे serotype से पुनः संक्रमण = गंभीर dengue का खतरा।

Why second dengue infection is more dangerous — Antibody-Dependent Enhancement (ADE): When you are infected with dengue for the first time (primary infection), your immune system makes antibodies against that specific serotype (say DENV-1). You recover and have lifelong immunity to DENV-1. If you are later infected with a different serotype (say DENV-2), those existing anti-DENV-1 antibodies recognise but cannot neutralise DENV-2. Instead, they help the virus enter immune cells (macrophages) more efficiently — dramatically amplifying viral replication. This ADE mechanism is why second dengue infections in India carry a much higher risk of Dengue Haemorrhagic Fever (DHF) and Dengue Shock Syndrome (DSS) — the severe, potentially fatal forms. The IgG test detects prior dengue exposure — a positive IgG in a patient with current dengue signals that this is a secondary infection and increased vigilance is needed. ADE: पहले serotype की एंटीबॉडी दूसरे serotype को मैक्रोफेज में प्रवेश में मदद करती हैं। द्वितीयक संक्रमण = DHF/DSS का अधिक खतरा। IgG+ = पुराना डेंगू संक्रमण = सावधानी बढ़ाएं।

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NS1 vs IgM vs IgG — When Each Test Is Positive

Image 2: Dengue test timeline — which test to order on which day of fever. NS1 antigen: detectable from Day 1, peaks Days 1–5, becomes negative by Day 5–7. Sensitivity: 70–95% on Days 1–3, falls to 50% by Day 5. IgM antibody: rises from Day 4–5, peaks at 2 weeks, persists for 2–3 months. IgG antibody: rises from Day 1–2 in secondary infection, weeks 2–3 in primary infection, persists lifelong. Optimal strategy: test both NS1 AND IgM/IgG simultaneously — catching both early (NS1) and late (IgM) presentations from one blood draw. A negative NS1 with negative IgM/IgG on Day 1–2 does NOT rule out dengue — repeat on Day 4–5 if fever continues.

NS1 Antigen — early detection test (Day 1–5) NS1 एंटीजन — शुरुआती परीक्षण

NS1 (Non-Structural Protein 1) is a dengue viral protein released into the bloodstream during the febrile (acute) phase. It is detectable as early as Day 1 of fever and peaks in Days 1–3. By Day 5–7, NS1 levels typically become undetectable as the immune system clears it. Sensitivity: 85–95% on Days 1–3; falls to 50–60% by Day 5. Specificity: >99% — a positive NS1 is highly reliable. Key rule: NS1 is the test of choice in the FIRST 5 days of fever. After Day 5, NS1 may be falsely negative even in confirmed dengue — switch to IgM antibody.

IgM Antibody — mid-phase test (Day 4 onwards) IgM एंटीबॉडी — मध्य चरण

IgM (Immunoglobulin M) is the first antibody the immune system produces in response to dengue infection. It becomes detectable from Day 4–5 of fever, peaks at 2 weeks, and persists for 2–3 months. Sensitivity of IgM: poor in the first 3–4 days (the immune system hasn't had time to make antibodies yet); rises to 90–95% by Day 5–7. Key rule: IgM is the test of choice after Day 5 of fever or when NS1 is negative but dengue is still clinically suspected. A positive IgM with negative IgG = primary (first-time) dengue infection.

IgG Antibody — secondary infection marker (lifelong) IgG एंटीबॉडी — पुराने संक्रमण का संकेत

IgG (Immunoglobulin G) antibody against dengue indicates prior dengue exposure. In a secondary infection (second dengue episode), IgG rises very rapidly — from Day 1–2 of fever — often appearing before IgM. IgG persists lifelong after any dengue infection. Key interpretations: IgM positive + IgG negative = primary dengue (first episode). IgM positive + IgG positive = secondary dengue (second episode — higher risk of severe dengue, DHF, DSS). IgG positive alone (no IgM, no NS1) = past resolved dengue — no current active infection (unless in very early window period).

Dengue PCR — most accurate but costly Dengue PCR — सबसे सटीक

Dengue RT-PCR detects viral RNA directly — gold standard for diagnosis and serotyping. Sensitivity: >95% on Days 1–5. Can identify the specific DENV serotype (DENV-1, 2, 3, or 4) — important for epidemiological surveillance and identifying secondary infection with a new serotype. Limitation: expensive (₹2,000–5,000 vs ₹500–800 for NS1+IgM/IgG combo), result in 6–12 hours, not widely available outside tertiary centres. In clinical practice, NS1 + IgM/IgG combo is sufficient for diagnosis. PCR is used when: result is equivocal; serotyping needed for public health; severely ill immunocompromised patient.

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Reading Your Report — All Combinations Explained

NS1	IgM	IgG	Interpretation	Action
POSITIVE	Negative	Negative	Early primary dengue — Day 1–4, first-ever infection. IgM hasn't risen yet.	Confirmed dengue. Start home monitoring: platelet + PCV every alternate day. Rest, hydration, paracetamol. No NSAIDs. Watch for warning signs.
POSITIVE	POSITIVE	Negative	Primary dengue, Day 4–7 — both NS1 and IgM positive. First-ever infection, now in mid-phase.	Confirmed dengue, primary. Daily platelet monitoring. Fluid intake 2–3 litres/day. Watch for warning signs carefully.
POSITIVE	POSITIVE	POSITIVE	Secondary dengue — second dengue episode. High risk of DHF/DSS. Needs close monitoring.	Confirmed secondary dengue. Strongly consider hospital admission — higher risk of severe dengue with secondary infection.
Negative	POSITIVE	Negative	Primary dengue, Day 5–14 — NS1 has cleared, IgM now positive. First infection confirmed.	Confirmed dengue (primary). Monitor platelets every 1–2 days. Most patients are recovering by this stage but platelet nadir may still be ahead.
Negative	POSITIVE	POSITIVE	Secondary dengue — past immunity (IgG) + active infection (IgM). Second episode. Higher severity risk.	Confirmed secondary dengue. Hospital admission advisable, especially if platelet count below 50,000 or any warning signs present.
Negative	Negative	POSITIVE	Past dengue, recovered — no active infection. IgG persists lifelong after any dengue episode.	No current dengue infection. Current fever is from another cause. Investigate for malaria, typhoid, chikungunya, leptospirosis.
Negative	Negative	Negative	Three possibilities: (1) Not dengue; (2) Very early dengue — Day 1–2, too early for NS1 sensitivity; (3) Late dengue — Day 8+, NS1 cleared, IgM fading.	If Day 1–2 of fever: repeat NS1+IgM/IgG on Day 4–5. If Day 4+: dengue unlikely — investigate other causes. Order CBC (platelet), malaria rapid test, Widal.

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Platelet Count in Dengue — What the Numbers Mean

Platelet monitoring is the single most important test during dengue management. Dengue virus attacks the bone marrow (reducing platelet production) and triggers immune-mediated platelet destruction — causing thrombocytopenia (low platelet count). Understanding the platelet count helps determine whether you need home management or hospital admission:

प्लेटलेट निगरानी डेंगू प्रबंधन का सबसे महत्वपूर्ण पहलू है। डेंगू वायरस अस्थि मज्जा पर हमला करता है और प्लेटलेट उत्पादन कम करता है।

Platelet Count	Clinical Grade	Risk	Management
1,50,000–4,50,000 /µL	Normal	None	Home management. Repeat CBC every 2–3 days if dengue confirmed.
1,00,000–1,50,000 /µL	Mild thrombocytopenia	Low — no spontaneous bleeding	Home management with daily monitoring. Strict bed rest. Maintain hydration. Watch for warning signs.
50,000–1,00,000 /µL	Moderate thrombocytopenia	Low-moderate	Daily platelet monitoring. Doctor consultation. Most guidelines recommend hospital observation. Avoid all NSAIDs, aspirin.
20,000–50,000 /µL	Severe thrombocytopenia	High — risk of bleeding	Hospital admission recommended. IV fluids if PCV rising. Strict monitoring every 6–12 hours. No invasive procedures without haematologist clearance.
< 20,000 /µL	Critical thrombocytopenia	Very high — spontaneous haemorrhage risk	Emergency hospitalisation. Platelet transfusion considered if active bleeding or below 10,000. ICU monitoring.

⚠️ Critical fact — platelet transfusion is NOT required for every low platelet count in dengue: Many Indian families rush to donate platelets or demand platelet transfusions when they see counts of 30,000–40,000 in dengue patients. The WHO and NVBDCP guidelines are clear: platelet transfusion in dengue is indicated only for spontaneous clinically significant bleeding OR platelet count below 10,000–20,000 /µL. Transfusing platelets prophylactically in dengue does NOT improve outcomes — transfused platelets are rapidly destroyed by the same mechanism that is destroying the patient's own platelets. The platelet count typically recovers spontaneously on Day 7–10 of illness as the immune response resolves. Adequate IV fluid therapy for plasma leakage prevention is far more important than platelet transfusion in dengue. प्लेटलेट ट्रांसफ्यूजन केवल सक्रिय रक्तस्राव या <10,000 पर जरूरी है। प्लेटलेट आमतौर पर Day 7–10 पर अपने आप ठीक होता है। IV fluid therapy प्लेटलेट ट्रांसफ्यूजन से अधिक महत्वपूर्ण है।

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Severe Dengue Warning Signs — Go to Hospital Immediately

Image 3: WHO dengue warning signs requiring immediate hospitalisation — these signs indicate transition from dengue fever to severe dengue (DHF/DSS). They typically appear on Day 3–7 of illness, often around or just after the fever breaks — this is the most dangerous window. Abdominal pain or tenderness; persistent vomiting (3+ episodes in 24 hours); rapid clinical deterioration; bleeding from any site; clinical fluid accumulation (pleural effusion, ascites); liver enlargement above 2 cm; rise in haematocrit with rapid fall in platelet count. Any ONE of these signs = immediate hospital evaluation.

 Go to hospital IMMEDIATELY — WHO warning signs तुरंत अस्पताल जाएं — WHO चेतावनी संकेत

Any ONE of these signs = emergency hospital evaluation:

• Abdominal pain or tenderness — especially right upper quadrant or generalised
• Persistent vomiting — 3 or more episodes in 24 hours; cannot maintain oral fluids
• Bleeding — from nose (epistaxis), gums, in urine, in stool (black tarry stools), vomiting blood, heavy menstrual bleeding
• Rapid clinical deterioration — patient who seemed okay suddenly very weak, drowsy, or confused
• Fluid accumulation — sudden abdominal swelling; breathlessness (pleural effusion)
• Liver enlargement — right upper quadrant tenderness on pressing
• Platelet below 20,000 — regardless of bleeding
• PCV (haematocrit) rising >20% from baseline with falling platelet — plasma leakage sign

The dangerous window — fever breaks ≠ danger over खतरनाक खिड़की — बुखार उतरना = खतरा नहीं

The most critical and counterintuitive fact about dengue: the most dangerous period is the 24–48 hours AFTER the fever breaks (typically Day 3–7). When fever subsides, plasma leaks from blood vessels into surrounding tissues — causing haemoconcentration (rising haematocrit), fluid accumulation (pleural effusion, ascites), and rapidly falling platelet count. A patient who seems "better" because the fever broke can deteriorate catastrophically within hours if plasma leakage is severe. This is the time to be most vigilant — not to relax. Monitor platelet every 12 hours during this window in hospitalised patients.

What NOT to do in dengue डेंगू में क्या न करें

• NO ibuprofen (Brufen, Advil), naproxen, aspirin, or diclofenac — NSAIDs inhibit platelet function and increase bleeding risk; ibuprofen can cause dengue-associated gastric haemorrhage
• NO aspirin — severe bleeding risk
• Only paracetamol (max 4 g/day) for fever and pain
• NO intramuscular (IM) injections in dengue — risk of muscle haematoma
• No herbal or alternative remedies that affect platelet function (giloy/tinospora should be used with caution — paradoxically, giloy can cause thrombocytopenia in some patients)
• Do not ignore the 24–48 hours after fever breaks — this is the highest-risk window

Home management — uncomplicated dengue घर पर प्रबंधन — सीधी डेंगू

For dengue patients without warning signs and platelets above 50,000:

• Hydration: 2–3 litres/day — oral ORS, coconut water, lime water, rice gruel, soups; avoid plain water alone (risk of hyponatraemia); avoid sugary carbonated drinks
• Paracetamol — up to 4 g/day, every 6 hours for fever. NEVER ibuprofen or aspirin
• Complete bed rest — no strenuous activity
• Platelet monitoring — CBC every alternate day minimum; daily if platelet below 1,00,000
• Mosquito protection — prevent further mosquito bites (patient is viraemic and can spread dengue to uninfected mosquitoes)

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Dengue vs Malaria vs Chikungunya — Differentiating Fever in India

Feature	Dengue	Malaria (Falciparum)	Chikungunya
Vector / वाहक	Aedes aegypti (day-biting)	Anopheles (night-biting)	Aedes aegypti (day-biting)
Fever pattern	High fever, continuous 3–7 days	Periodic (every 48–72 hrs) or continuous in falciparum	Sudden high fever 2–3 days then resolves
Rash	Maculopapular rash Day 3–5, starts trunk	None typically	Maculopapular rash early (within 1–2 days)
Joint pain	Mild-moderate — primarily muscle pain	Mild generalised myalgia	Severe joint pain (arthritis) — hallmark
Platelet count	Low — characteristic	Normal or mildly low	Normal (mild thrombocytopenia possible)
Haematocrit (PCV)	Rising (plasma leakage)	Low (haemolytic anaemia)	Normal
WBC count	Low (leucopenia)	Normal or high (with malaria)	Normal or mildly low
Key diagnostic test	NS1 antigen (Day 1–5) + IgM/IgG	Malaria rapid antigen test + smear + PCR	Chikungunya IgM ELISA (Day 5 onward)
Specific treatment	None — supportive only	Artemisinin combination therapy (ACT)	None — supportive (NSAIDs for joints acceptable in chikungunya, NOT dengue)

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Test Preparation Checklist / टेस्ट की तैयारी

Dengue tests require minimal preparation — but correct timing and test selection are critical:

डेंगू परीक्षण के लिए न्यूनतम तैयारी — लेकिन सही समय और परीक्षण चयन महत्वपूर्ण है।

• ✓
  No fasting required. NS1 antigen, IgM, and IgG are immunological tests — food intake does not affect antibody or antigen levels. You can eat and drink normally before the blood draw.
• ✓
  Time the test correctly — match test to day of fever. Day 1–4 of fever: order NS1 antigen + IgM/IgG combo. Day 5+ of fever: NS1 may be false negative — order IgM/IgG primarily. Day 1–2 with negative results: repeat on Day 4–5 if fever continues. Do not rely on a single negative Day 1 test to exclude dengue.
• ✓
  Always order CBC with platelet count simultaneously. A CBC alongside dengue serology is mandatory — the characteristic findings (thrombocytopenia + leucopenia + rising haematocrit) strongly support the dengue diagnosis and guide management urgency. A platelet count tells you more about severity and need for admission than the NS1/IgM result itself.
• ✓
  Order NS1 + IgM/IgG as a combo panel, not individually. The "Dengue Panel" or "Dengue Duo/Trio" available at Indian labs tests NS1 + IgM + IgG from one blood draw at ₹500–900. Ordering individually costs more and uses more blood. The combination catches both early (NS1) and late-presenting (IgM) infections and identifies primary vs secondary infection (IgG).
• ✓
  Use ELISA-based testing, not just rapid card tests for clinical decisions. Rapid card tests (lateral flow) for NS1 and IgM/IgG are widely available at small labs and clinics. They have lower sensitivity than ELISA — particularly for IgM in early illness. For clinical management decisions and documentation, NABL-accredited ELISA-based dengue testing is preferred.
• ✓
  Repeat platelet monitoring every 1–2 days during active dengue. A single platelet count means very little — the trend matters. A count of 80,000 today with a trend of dropping 30,000 per day is more concerning than a stable 40,000. Daily CBC during the acute febrile phase, and every 12 hours during the critical (post-fever) phase, is the standard in Indian dengue wards.
• ✓
  Do not start ibuprofen, aspirin, or diclofenac before the test or during dengue management. NSAIDs are dangerous in dengue — they inhibit platelet function and worsen bleeding risk. Only paracetamol is safe for fever in dengue. Inform the lab and your doctor if you have already taken any NSAID — it can affect platelet function tests.

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✅ Book Dengue Test (NS1 + IgM + IgG) + CBC — Home Collection Available

Always book the Dengue Panel (NS1 antigen + IgM antibody + IgG antibody) together with CBC (platelet count). Both are essential — the serology confirms dengue, the platelet count determines management urgency:

Dengue Panel (NS1 + Anti-Dengue IgM + IgG) + CBC with Platelet Count Dengue NS1 antigen + IgM + IgG + CBC with differential and platelet count · NABL-accredited ELISA method · Home collection · No fasting required · Digital report in 4–6 hours · Available across India · Test on Day 1–4 for best NS1 sensitivity

Book Dengue Test →

Affiliate link: I may earn a small commission at no extra cost to you. Dengue testing is available free at government hospitals and urban primary health centres across India, particularly during monsoon outbreak season. If you have any WHO warning signs (persistent vomiting, bleeding, abdominal pain, sudden deterioration after fever breaks) — go directly to the hospital emergency department rather than waiting for home collection results.

WHO चेतावनी संकेत (लगातार उल्टी, रक्तस्राव, पेट दर्द, बुखार उतरने के बाद अचानक बिगड़ना) पर सीधे अस्पताल जाएं। सरकारी अस्पतालों में निःशुल्क डेंगू टेस्ट।

 Dengue Recovery Support — Immunity & Hydration

Dengue management is entirely supportive — no specific antiviral treatment exists. Maintaining adequate hydration and supporting immune recovery are the two most important cornerstones of home management for uncomplicated dengue. Always consult your doctor if platelet count drops below 50,000 or any warning sign develops — do not rely on supplements as a substitute for hospital care.

Nveda Immunity Booster — Papaya Leaf Extract Tablets for Men & Women

Papaya leaf extract (Carica papaya) is the most widely used adjunct supplement in dengue management in India. Multiple clinical studies — including a randomised controlled trial published in BMC Complementary Medicine — show that standardised papaya leaf extract may help reduce the rate of platelet decline and support earlier platelet recovery in dengue patients. The active compounds (carpain, chymopapain, and acetogenins) are thought to inhibit platelet destruction and support megakaryocyte (platelet-producing cell) activity. Widely recommended by Indian physicians as an adjunct. Important: papaya leaf extract is not a treatment for dengue and does not replace hospital admission when warning signs are present. Always consult your doctor before use.

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OSMO Electrolyte Powder — 45 Servings, Unflavoured, ORS-Style Hydration

Adequate oral hydration is the single most effective intervention for preventing severe dengue — specifically preventing the plasma leakage that leads to DHF/DSS. The WHO recommends dengue patients maintain 2–3 litres of fluid intake daily. Plain water alone can cause dangerous hyponatraemia (low sodium) in dengue — electrolyte-balanced oral rehydration is far superior. OSMO provides a science-based electrolyte formulation (sodium, potassium, chloride, magnesium) that closely mimics WHO ORS composition without artificial flavours or excessive sugar. Particularly useful for dengue patients who find standard ORS sachets unpalatable and are therefore not drinking enough. Consult your doctor about fluid restrictions in dengue with pulmonary oedema or ascites.

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Know someone with fever and a dengue positive report who needs to understand their results? Share this guide. क्या आप किसी को जानते हैं जिन्हें डेंगू पॉजिटिव आया और NS1, IgM, IgG समझना है? यह गाइड शेयर करें।

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Related Tests / संबंधित जांचें

These tests are commonly ordered alongside dengue serology in fever workup across India:

डेंगू serology के साथ ये जांचें अक्सर करवाई जाती हैं:

CBC (Platelet Count) Malaria Antigen Test Widal Test (Typhoid) ESR Test Liver Function Test (LFT) How to Read a Blood Test Report

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Frequently Asked Questions / अक्सर पूछे जाने वाले सवाल

My NS1 is positive. How serious is dengue? What should I do right now?

A positive NS1 confirms active dengue infection — but dengue severity varies enormously. Most patients (80–90%) have uncomplicated dengue fever that resolves in 7–10 days with supportive care alone. What you must do right now: First — check your platelet count (CBC). If platelets are above 1,00,000, home management is typically appropriate. Second — stop ibuprofen/aspirin immediately if you were taking them for fever — switch to paracetamol only (maximum 4 g/day). Third — drink 2–3 litres of ORS/electrolyte fluid per day — this is the most important treatment for preventing severe dengue. Fourth — know the warning signs and go to hospital if any develop (persistent vomiting, bleeding, severe abdominal pain, weakness after fever breaks). Fifth — repeat CBC every 1–2 days to monitor platelet trend. If platelet drops below 50,000, hospital admission is advisable regardless of symptoms. No specific antiviral treatment for dengue exists — supportive care and vigilant monitoring ARE the treatment.

उत्तर: NS1+ = डेंगू पुष्टि। तुरंत: CBC जांचें, ibuprofen बंद करें, 2–3L ORS/इलेक्ट्रोलाइट पिएं, warning signs जानें, हर 1–2 दिन CBC दोहराएं।

Is fasting required before dengue test?

No — fasting is not required for dengue NS1 antigen, IgM, or IgG antibody tests. All three are immunological assays detecting viral proteins or antibodies in blood serum — food intake does not affect these markers. You can eat and drink normally before the blood draw. However, since dengue tests are almost always ordered alongside CBC (which also does not require fasting) and sometimes alongside LFT (liver function — may require fasting), confirm with your lab whether any fasting-required tests are being added to the same blood draw.

उत्तर: नहीं — NS1, IgM, IgG और CBC के लिए उपवास आवश्यक नहीं।

My NS1 is negative but IgM is positive. What does this mean?

NS1 negative + IgM positive is a completely expected and normal pattern in dengue presenting after Day 5 of fever. NS1 antigen is typically detectable only in the first 1–5 days of dengue illness — after that, the immune system clears NS1 from the blood. IgM antibody, on the other hand, rises from Day 4–5 onwards. A patient tested on Day 6–14 of fever would typically have: NS1 negative (already cleared) + IgM positive (immune response in full swing). This pattern confirms dengue — the diagnosis is as solid as NS1 positive alone. The good news in this clinical context is that the patient is likely past the febrile peak and entering the recovery phase — though the critical window (24–48 hours post-fever break) still requires careful platelet monitoring and vigilance for warning signs.

उत्तर: NS1− + IgM+ = Day 5+ पर सामान्य पैटर्न। NS1 Day 5 के बाद साफ हो जाता है। IgM Day 4–5 से उठता है। डेंगू पुष्टि — NS1+ जितना ही विश्वसनीय।

My platelet count is 45,000. Do I need a platelet transfusion?

Almost certainly not — at 45,000 without active bleeding. This is one of the most common and well-intentioned misconceptions among Indian families managing dengue. Platelet transfusion in dengue is not indicated based on platelet count alone unless: (1) active clinically significant bleeding is occurring (not just a nosebleed — significant gastrointestinal bleeding, haematuria, heavy haemoptysis); or (2) the platelet count falls below 10,000–20,000 /µL — the level at which spontaneous haemorrhage risk becomes significant. At 45,000 /µL with no bleeding, the platelet count will almost certainly recover spontaneously on Day 7–10 as the dengue immune response resolves. Transfused platelets are destroyed at the same rapid rate as the patient's own platelets — prophylactic transfusion does not improve outcomes and may cause reactions. What is important at a platelet count of 45,000: hospital admission for monitoring; complete bed rest (avoid risk of traumatic haemorrhage); strict avoidance of NSAIDs and aspirin; IV fluids for haemoconcentration if haematocrit is rising; daily or twice-daily platelet monitoring.

उत्तर: 45,000 पर बिना रक्तस्राव के प्लेटलेट ट्रांसफ्यूजन जरूरी नहीं। ट्रांसफ्यूजन: केवल सक्रिय महत्वपूर्ण रक्तस्राव OR <10,000–20,000। प्लेटलेट Day 7–10 पर अपने आप ठीक होता है।

Can dengue come back? I had it 3 years ago.

Yes — you can get dengue multiple times (up to 4 times, once with each serotype). After recovery from dengue with one serotype (say DENV-1), you have lifelong immunity to that specific serotype — but you remain susceptible to the other 3 serotypes (DENV-2, DENV-3, DENV-4). Critically, a second dengue infection with a different serotype is more dangerous than the first — due to Antibody-Dependent Enhancement (ADE) where existing antibodies from the first infection actually help the second virus replicate more efficiently in immune cells. This is why secondary dengue (IgG positive on current illness) carries higher risk of Dengue Haemorrhagic Fever (DHF) and Dengue Shock Syndrome (DSS). If you had dengue 3 years ago and are now ill with fever during dengue season, your IgG will be positive (lifelong from first infection) and if dengue NS1 or IgM is also positive, this confirms a secondary infection — warranting close monitoring and low threshold for hospital admission.

उत्तर: हाँ — 4 बार तक (प्रत्येक serotype से)। दूसरा संक्रमण अधिक खतरनाक (ADE)। तीन साल पहले डेंगू → IgG+ अभी → Secondary infection → DHF/DSS का खतरा → अस्पताल में भर्ती पर विचार करें।

Does papaya leaf juice/extract really increase platelets in dengue?

Papaya leaf extract has more evidence behind it than most home remedies for dengue — but the evidence is modest and the effect should not be overstated. Multiple small randomised controlled trials from India, Malaysia, and Sri Lanka show that standardised papaya leaf extract may modestly reduce the rate of platelet decline and support earlier platelet recovery in dengue patients compared to placebo — not a dramatic effect, but a real one. The proposed mechanism involves active compounds (carpain, acetogenins) inhibiting dengue-induced platelet destruction and supporting megakaryocyte (platelet-producing cell) activity. Fresh papaya leaf juice is also used in India — while less standardised than capsule extracts, it contains the same active compounds. Important caveats: papaya leaf extract is an adjunct, not a treatment — it does not treat dengue or replace hospital care when warning signs are present. The platelet would recover on its own in most cases even without papaya leaf, particularly in primary infection. Do not delay seeking hospital care in favour of papaya leaf treatment when warning signs are present.

उत्तर: हाँ — कुछ evidence है। Standardised papaya leaf extract प्लेटलेट गिरावट की दर कम करने और जल्दी ठीक होने में मदद कर सकता है। लेकिन यह adjunct है, उपचार नहीं। Warning signs पर अस्पताल ही जाएं।

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External References / बाहरी संसाधन

• WHO — Dengue: WHO Dengue Fact Sheet
• NVBDCP (Govt of India): National Vector Borne Disease Control Programme — Dengue Guidelines
• MedlinePlus: Dengue — Patient Information

⚠️ Medical Disclaimer / चिकित्सा अस्वीकरण

This article is for educational purposes only. A positive dengue test must be evaluated by a qualified physician alongside platelet count trend, haematocrit, and clinical warning signs. Never attempt to manage severe dengue with home remedies alone. If any WHO warning sign is present — go directly to a hospital emergency department. Do not give ibuprofen, aspirin, or naproxen during dengue. Platelet transfusion decisions must be made by a qualified haematologist or internist — not based on a number alone.

यह लेख केवल शैक्षिक उद्देश्यों के लिए है। WHO चेतावनी संकेत पर सीधे अस्पताल जाएं। डेंगू में ibuprofen/aspirin कभी नहीं। प्लेटलेट ट्रांसफ्यूजन निर्णय केवल विशेषज्ञ चिकित्सक लें।

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