Dengue Test (NS1, IgM, IgG)
Blood tests to diagnose dengue fever.
Quick Summary
To confirm dengue in people with fever during the dengue season.
NS1 antigen (first days of fever) and IgM/IgG antibodies (after about 5 days).
No preparation needed.
Overview
NS1 is best in the first five days of fever; antibodies are better later.
A blood count to monitor platelets and haematocrit is done alongside.
What It Measures
NS1 antigen
Early infection.
IgM
Recent infection.
IgG
Past or repeat infection.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Interpreting Results & Next Steps
Discuss with Doctor
A negative early test doesn't rule it out; repeat testing may be needed. Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
A positive NS1 or IgM supports dengue.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Dengue Fever Test(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Dengue and severe dengue(opens in a new tab) · World Health Organization