Dengue IgG (Rapid)
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The Dengue IgG test detects IgG antibodies against the dengue virus, indicating past exposure or secondary infection.
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🧪 Dengue IgG – Rapid Test
📌 What is it?
The Dengue IgG Rapid Test is a quick diagnostic test used to detect Immunoglobulin G (IgG) antibodies against the dengue virus in human blood, typically from a finger-prick or venous blood sample. This test helps identify past dengue infection or secondary infection during an acute episode.
It is commonly used in field settings, primary care clinics, or emergency evaluations due to its speed and ease of use.
⚡ Why is it Done?
Purpose | Explanation |
|---|---|
Screen for past dengue exposure | IgG indicates previous infection and possible immunity |
Aid in diagnosing secondary dengue | If IgG is positive along with IgM or symptoms, suggests secondary dengue |
Quick triage in dengue outbreaks | Enables rapid decision-making in high-volume situations |
🕒 When is it Done?
Time Since Infection | Antibody Likely to Appear |
|---|---|
0–5 days | NS1 Antigen |
4–7 days | IgM Antibodies |
7+ days | IgG Antibodies |
IgG appears later than NS1 and IgM and can persist for months to years.
🔬 Test Method
Parameter | Details |
|---|---|
Sample Required | Capillary or venous blood |
Method | Lateral Flow Immunoassay (Rapid Card) |
Time to Result | 15–20 minutes |
Result Type | Qualitative (Positive/Negative) |
Fasting Required | ❌ No |
📊 Result Interpretation
Result | Meaning |
|---|---|
IgG Negative | No prior dengue exposure or very early phase |
IgG Positive | Past infection or potential secondary infection |
IgG + IgM Positive | Suggestive of secondary infection (more severe dengue likely) |
🔗 Recommended Additional Tests
Test | Reason |
|---|---|
Dengue NS1 Antigen | Detect virus early (0–5 days), confirms active infection |
Dengue IgM Rapid | Detects recent primary infection |
CBC with Platelets | Monitor thrombocytopenia and hemoconcentration |
Liver Function Tests | Dengue may affect liver function |
⚠️ Limitations
- Lower sensitivity than ELISA or CLIA methods.
- May give false negatives in early or late stages.
- Cannot quantify antibody levels.
- Cross-reactivity with other flaviviruses (e.g., Zika, West Nile) is possible.
✅ Summary Table
Aspect | Details |
|---|---|
Marker For | Past or secondary dengue infection |
Method | Rapid Card (Lateral Flow Immunoassay) |
Time to Result | ~15 minutes |
Fasting Required | No |
Sample Type | Finger-prick or venous blood |
Best Use | Fast screening in suspected dengue cases |
How our test process works!
