Dengue IgM

Also known as: Dengue IgM Antibody, Dengue Serology

Infectious Diseases Blood
Patient Friendly Summary

IgM is your body's alarm bell after it recognizes dengue. Doctors combine the test date, your fever day, and platelet trend to read it correctly.

What this test means

IgM antibodies are the body's first defence response to dengue, appearing around the fourth or fifth day of illness and lasting weeks.

Why it is done

It is done when fever has lasted 4–5 days or more and dengue is suspected, often when NS1 was negative or not done early.

Understanding your value

If your value is high

A positive IgM suggests recent dengue infection.

If your value is low

A negative IgM very early in illness can be a false reassurance — the antibodies simply haven't formed yet.

About the normal range

IgM can stay positive for 1–3 months after recovery, so a positive result reflects recent — not necessarily active — infection.

When to consult a doctor

Monitor as your doctor advises during dengue. Seek prompt care for warning signs: bleeding, severe pain, persistent vomiting, or drowsiness.

Frequently Asked Questions

It is done when fever has lasted 4–5 days or more and dengue is suspected, often when NS1 was negative or not done early. Your doctor will decide if this test is right for your situation.

A positive IgM suggests recent dengue infection. This needs clinical correlation — always discuss your report with your doctor.

A negative IgM very early in illness can be a false reassurance — the antibodies simply haven't formed yet. 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 IgM
  • Short formsDengue IgM Antibody, Dengue Serology
  • Sample typeBlood
  • CategoryInfectious Diseases

Related Terms

Positive Reactive Infection

Specialists

General Medicine Pediatrics

Related Tests

Test
Dengue NS1

Detects dengue virus protein in the first days of fever.

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Test
Platelet Count

Counts the small cells that help your blood clot.

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Test
Complete Blood Count

A panel that counts red cells, white cells, and platelets in your blood.

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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.