Dengue NS1

Also known as: NS1 Antigen, Dengue Antigen Test

Infectious Diseases Blood
Patient Friendly Summary

Dengue tests are like train timetables — NS1 catches the early train, IgM the later one. A negative test on the wrong day means little, so testing may be repeated.

What this test means

NS1 is a protein the dengue virus releases early in infection. The test works best in the first 1–5 days of fever, before antibodies appear.

Why it is done

It is done for fever during dengue season, especially with body ache, headache behind the eyes, or rash.

Understanding your value

If your value is high

A positive NS1 suggests current dengue infection — platelet counts are then monitored until recovery.

If your value is low

A negative NS1 late in the illness does not rule out dengue; the IgM antibody test takes over after day 4–5.

About the normal range

Timing is everything: NS1 is most reliable on days 1–5 of fever, IgM from day 4–5 onwards. Your doctor picks the right test for the day.

When to consult a doctor

If dengue is confirmed, follow your doctor's monitoring plan. Seek care promptly for bleeding, severe abdominal pain, persistent vomiting, or extreme weakness.

Frequently Asked Questions

It is done for fever during dengue season, especially with body ache, headache behind the eyes, or rash. Your doctor will decide if this test is right for your situation.

A positive NS1 suggests current dengue infection — platelet counts are then monitored until recovery. This needs clinical correlation — always discuss your report with your doctor.

A negative NS1 late in the illness does not rule out dengue; the IgM antibody test takes over after day 4–5. This needs clinical correlation — always discuss your report with your doctor.

A single value rarely tells the whole story. Results need to be read together with your symptoms, history, and other tests. Please consult your doctor for a proper interpretation.

Quick Facts

  • TestDengue NS1
  • Short formsNS1 Antigen, Dengue Antigen Test
  • Sample typeBlood
  • CategoryInfectious Diseases

Related Terms

Positive Negative Infection

Specialists

General Medicine Pediatrics

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Disclaimer: This information is for patient education only and does not replace medical advice, diagnosis, or treatment. Always consult a qualified doctor.