Typhi Dot IgG & IgM
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Detects IgG & IgM antibodies against Salmonella Typhi, the bacterium responsible for typhoid fever
₹569₹880
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🧪 What is Typhi Dot IgG & IgM?
The Typhi Dot IgG & IgM test is a rapid serological assay that detects both IgM and IgG antibodies against Salmonella Typhi, the bacterium responsible for typhoid fever:
- IgM antibodies indicate a recent or acute infection.
- IgG antibodies indicate past exposure, chronic infection, or immunity following vaccination or recovery.
❓ Why is the Test Done?
To:
- Diagnose acute typhoid fever (IgM detection)
- Identify past infection or immunity (IgG detection)
- Support clinical diagnosis when blood cultures are negative or unavailable
- Monitor disease progression or response to treatment
📊 Normal Range / Interpretation
Result | Interpretation |
|---|---|
Negative IgM & IgG | No evidence of infection or past exposure |
Positive IgM only | Suggests recent or acute infection |
Positive IgG only | Indicates past infection, chronic carrier state, or immunity |
Positive IgM & IgG | Active infection in a later phase or recent infection |
📈 Interpretation of Results
Result Pattern | Clinical Significance |
|---|---|
IgM Positive, IgG Negative | Early or acute typhoid fever |
IgM Positive, IgG Positive | Active or ongoing infection |
IgM Negative, IgG Positive | Past infection or immunity |
IgM Negative, IgG Negative | No infection or very early stage |
🧠 Associated Conditions
Condition | Details |
|---|---|
Acute typhoid fever | Febrile illness caused by Salmonella Typhi |
Chronic carrier state | Persistent bacterial carriage without symptoms |
Post-vaccination immunity | Antibody presence following typhoid vaccination |
🔄 Related / Follow-Up Tests
- Blood culture – gold standard for diagnosing active infection
- Widal test – traditional serological assay
- PCR for Salmonella DNA – molecular diagnostic test
✅ Fasting Required?
Test | Fasting Required |
|---|---|
Typhi Dot IgG & IgM | ❌ No |
📝 Summary Table
Parameter | Details |
|---|---|
What | Detects IgM and IgG antibodies to Salmonella Typhi |
Why | Diagnose acute and past typhoid infection |
Normal Result | Negative for both IgM and IgG antibodies |
Positive Result | IgM indicates recent infection; IgG indicates past exposure or immunity |
Associated Conditions | Typhoid fever, chronic carrier, post-vaccination immunity |
Follow-up Tests | Blood culture, Widal test, PCR |
Fasting Required | ❌ No |
How our test process works!
