What this test measures
The Dengue Profile is a comprehensive panel testing three markers simultaneously: - **NS1 antigen** — viral protein detectable from day 1 to day 7 of fever - **IgM antibody** — appears day 4–5 of fever, lasts 2–3 months - **IgG antibody** — appears from day 7 in primary infection, earlier and higher in secondary infection
The combination maximises diagnostic yield across the full timeline of dengue illness and helps distinguish primary from secondary infection — which matters because secondary dengue carries higher risk of severe disease.
Why it matters
In India's annual monsoon dengue epidemics, the Dengue Profile is the most ordered panel. NCDC, ICMR, and NIV Pune all endorse multi-marker testing because no single marker covers the full illness timeline reliably.
The profile is most useful in patients presenting with fever for more than 3 days, where the timing of antibody response is uncertain. The IgG component identifies secondary dengue — which carries higher risk of dengue haemorrhagic fever (DHF) and dengue shock syndrome (DSS) due to antibody-dependent enhancement. A patient with positive NS1 + positive IgG (without prior known dengue) likely has secondary infection and needs close monitoring.
How to prepare
No fasting required. The test uses serum, plasma or whole blood. Mention day of fever onset and any prior dengue or dengue vaccination.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Dengue NS1 Antigen (Reactive / Non-reactive)[1] | Non-reactive (Negative) | Non-reactive — no detectable NS1. After day 7, sensitivity drops; rely on IgM. | Reactive — confirmed acute dengue (days 1–7). Begin clinical monitoring. |
| Dengue IgM (Reactive / Non-reactive)[1] | Non-reactive (Negative) | Non-reactive — no recent dengue antibody. If fever < 5 days, IgM may be too early. | Reactive — recent dengue infection (day 5+). Lasts 2–3 months. |
| Dengue IgG (Reactive / Non-reactive)[1] | Reactive in past infection | Non-reactive — no past dengue exposure. | Reactive early in fever with positive NS1/IgM = secondary infection — higher severe-dengue risk. Reactive months after recovery = past infection. |
Dengue profile patterns — clinical interpretation
| NS1 | IgM | IgG | Pattern | Severity risk |
|---|---|---|---|---|
| Positive | Negative | Negative | Early primary dengue (day 1–4) | Standard |
| Positive | Positive | Negative | Acute primary dengue (day 5–7) | Standard |
| Positive | Positive | Positive (high) | Acute secondary dengue | Higher — monitor closely |
| Negative | Positive | Negative | Convalescent primary dengue | Resolving |
| Negative | Negative | Positive | Past dengue infection | N/A |
| Negative | Negative | Negative | Not dengue (consider chikungunya, malaria, typhoid, leptospirosis) | N/A |
Frequently asked questions
Why is the triple marker better than NS1 alone?
NS1 covers days 1–7 only. After day 7, IgM is the more reliable marker. IgG helps identify secondary infection (higher severity risk). The triple panel covers the full illness timeline.
My profile shows NS1+, IgM+, IgG+ early in fever. What does that mean?
This pattern strongly suggests secondary dengue (you have had dengue before). Secondary infection carries higher risk of dengue haemorrhagic fever and shock — daily monitoring of platelets and warning signs is essential.
What are dengue warning signs?
Severe abdominal pain, persistent vomiting, mucosal/skin bleeding, lethargy or restlessness, rapid breathing, fluid accumulation (pleural effusion, ascites), rapid drop in platelets, or rise in haematocrit.
How often should platelets be monitored?
Daily once dengue is confirmed. Falls below 100,000 need closer monitoring; below 50,000 may need hospital admission; below 20,000 carries bleeding risk and platelet transfusion is considered.
Can I get dengue more than once?
Yes — dengue has four serotypes (DENV-1 to DENV-4). Infection with one gives lifelong immunity to that serotype but only short-term cross-protection. Secondary infection with a different serotype carries higher severity risk.
Is there treatment for dengue?
No specific antiviral. Management is supportive — fluid balance, paracetamol for fever, platelet monitoring. NSAIDs and aspirin must be avoided.
How can I protect my family?
Eliminate stagnant water at home (Aedes mosquitoes breed in clean water), use mosquito repellents and screens, wear long sleeves at dawn and dusk. Vector control is the most effective prevention.
Related Infectious Disease tests
Tests commonly ordered alongside Dengue profile (NS1, IgG, IgM), or that help interpret an unexpected result.
Sources & references
- NIV Pune — Dengue Research and Diagnosis · accessed 2026-05-30T00:00:00.000Z
- NCDC India — Dengue · accessed 2026-05-30T00:00:00.000Z
- WHO — Dengue Fact Sheet · accessed 2026-05-30T00:00:00.000Z
- ICMR India — Dengue Guidelines · accessed 2026-05-30T00:00:00.000Z
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