Dengue NS1 Antigen
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Category
Blood
Sample
Blood
Report Time
4 hrs
Fasting
Not needed
About Dengue NS1 Antigen
The dengue NS1 antigen test detects a viral protein (non-structural protein 1) that circulates in the blood from the very first day of dengue fever. Because it is positive early, usually from day 1 to about day 5 of fever, it can confirm dengue before antibodies develop, which makes it the preferred test in the first few days of illness.
Dengue is spread by Aedes mosquitoes, which breed in clean stagnant water, and cases peak in India after the monsoon, from roughly July to November. Symptoms include sudden high fever, severe headache, pain behind the eyes, muscle and joint pain (break-bone fever), nausea and rash. A fall in platelets typically begins around day 3 to 5, which is why a complete blood count is usually done with NS1.
A positive NS1 is strongly suggestive of dengue. A negative result does not exclude dengue, especially after day 5, when NS1 declines and IgM antibodies become the better test. Rapid card and ELISA methods exist; ELISA is more sensitive.
When Should You Get This Test?
A dengue NS1 test is commonly advised for:
- Fever of up to five days during or after the monsoon.
- Fever with severe body ache, headache, pain behind the eyes or rash.
- Low platelets with fever.
- Living in or travelling from a dengue-affected area.
Conditions This Test Can Detect
The test helps to identify:
- Early dengue infection (all four serotypes).
- Patients who need close monitoring of platelets and hydration.
- Dengue versus other fevers such as malaria, typhoid, chikungunya and influenza.
Warning signs needing urgent care include severe abdominal pain, repeated vomiting, bleeding, drowsiness, cold clammy skin or reduced urine.
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How to Prepare
- No fasting or special preparation is needed.
- Test as early as possible, ideally within the first five days of fever.
- Note the day your fever started, so the lab and doctor can choose the right test.
Normal Reference Ranges
| Result | Meaning |
|---|---|
| Positive | Dengue infection very likely |
| Negative (early, day 1–5) | Dengue less likely; repeat or add IgM if fever continues |
| Negative (after day 5) | Does not exclude dengue; IgM/IgG advised |
Results depend on timing and method.
Further reading: MedlinePlus – Lab tests, Mayo Clinic – Tests & procedures, Cleveland Clinic – Diagnostics, Lab Tests Online. Values are approximate and may vary by laboratory; this page is general information, not medical advice.
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Frequently Asked Questions
When should I do NS1 versus IgM?
NS1 in the first five days, IgM from about day 5 onward.
Does NS1 tell me how severe dengue is?
No. Platelets, hematocrit and symptoms guide severity.
What should I do at home with dengue?
Rest, drink plenty of fluids, take paracetamol for fever, avoid aspirin and ibuprofen, and follow your doctor's monitoring advice.
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Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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