✍️ Edited by Farhan Ahmed, Editor, MedTestBD · Last updated: August 2026
What is the Dengue IgG/IgM Test?
The Dengue IgG/IgM antibody test detects the immune response to dengue virus infection by measuring two types of antibodies — IgM and IgG — in the blood. IgM antibodies appear first, typically from day 4–5 of fever, indicating a current or very recent infection. IgG antibodies develop later and can persist for months to years, indicating a past infection. Together they help determine the timing and nature of dengue exposure.
Why is the Dengue IgG/IgM Test Done?
- To confirm dengue infection when fever has lasted more than 5 days and the NS1 antigen test window has passed
- To differentiate between a primary dengue infection (first time) and a secondary infection (repeat) — secondary infections carry a higher risk of severe dengue
- To investigate fever with body aches, rash, or low platelet count in the dengue season
- Often ordered alongside NS1 antigen and CBC to complete the dengue diagnostic picture
- To confirm past dengue exposure in patients being evaluated for recurrent illness
How to Interpret Dengue IgG/IgM Results
| IgM | IgG | Interpretation |
|---|---|---|
| Positive | Negative | Primary (first-time) dengue infection — current |
| Positive | Positive | Secondary dengue infection — higher severity risk |
| Negative | Positive | Past dengue infection — no active current disease |
| Negative | Negative | No dengue antibodies — infection unlikely or too early to detect |
A negative result in the first 4 days of fever does not rule out dengue — antibodies may not yet have developed. In that window, the NS1 antigen test is more reliable. Your doctor will interpret serology results alongside NS1, CBC platelet trend, and clinical symptoms.
How to Prepare for the Dengue IgG/IgM Test
- No fasting is required
- The test is most reliable from day 5 of fever onwards
- Inform your doctor about the exact day your fever started — this is critical for correct interpretation
- Inform the doctor about any previous dengue infection, as prior exposure affects antibody patterns
- A simple blood sample is drawn from a vein in your arm
Dengue IgG/IgM Test Price in Bangladesh
Dengue IgG/IgM test prices vary between diagnostic centers across Bangladesh. Compare dengue IgG/IgM test prices on MedTestBD →
Normal ranges cited on this page are based on MedlinePlus and WHO guidance. Prices are collected from public sources and may change — confirm with the facility before visiting. This information is for general reference only and is not medical advice. Always consult a qualified physician.
