Widal Slide Test (4Hrs)
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Serological test for typhoid fever by detecting antibodies against Salmonella.
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🧪 What is the Widal Slide Test?
The Widal Slide Test is a rapid serological screening test used to detect agglutinating antibodies (O and H antigens) against Salmonella Typhi and Salmonella Paratyphi in a patient’s serum. The "4 Hours" indicates that the test is designed to provide results within approximately 4 hours.
❓ Why is the Test Done?
To:
- Support the diagnosis of typhoid fever in symptomatic patients
- Screen for exposure to Salmonella species in endemic areas
- Monitor immune response during and after infection
📊 Normal Range / Interpretation
Result | Interpretation |
|---|---|
Negative (no agglutination) | No significant antibody levels; unlikely active infection |
Positive (agglutination present) | Suggests current or past infection/exposure to Salmonella |
📈 Interpretation of Results
Antibody Type | Significance |
|---|---|
O antigen (somatic) | Appears early; indicates active or recent infection |
H antigen (flagellar) | Appears later; indicates current or past infection |
Rising titers on repeated testing confirm diagnosis.
🧠 Associated Conditions
Condition | Details |
|---|---|
Typhoid fever | Systemic infection caused by Salmonella Typhi |
Paratyphoid fever | Caused by Salmonella Paratyphi serotypes |
🔄 Related / Follow-Up Tests
- Widal Tube Test – quantitative and more specific
- Blood culture – gold standard for diagnosis
- PCR for Salmonella DNA – molecular diagnosis
✅ Fasting Required?
Test | Fasting Required |
|---|---|
Widal Slide Test (4 Hrs) | ❌ No |
📝 Summary Table
Parameter | Details |
|---|---|
What | Rapid slide agglutination test for Salmonella antibodies |
Why | Support diagnosis of typhoid/paratyphoid fever |
Normal Result | Negative; no significant agglutination |
Positive Result | Presence of O and/or H antibodies; indicates infection or exposure |
Associated Conditions | Typhoid and paratyphoid fever |
Follow-up Tests | Widal tube test, blood culture, PCR |
Fasting Required | ❌ No |
How our test process works!
