Widal Test (Slide Agglutination)
- Category
- Fever
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
The Widal test (slide agglutination) detects antibodies against Salmonella Typhi and Paratyphi bacteria (O and H antigens).
Why this test is performed?
Supports the diagnosis of typhoid (enteric) fever in a person with prolonged fever. Results are best interpreted after the first week of fever.
Who should take this test?
Fever lasting more than 2–3 days, chills, body ache, rash, headache or vomiting — especially in monsoon season.
Test Preparation
No fasting needed.
What's included 4 parameters
Widal (4)
- Salmonella Paratyphi A
- Salmonella Paratyphi B
- Salmonella Typhi H
- Salmonella Typhi O
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 5 days
- No fasting
- Report time: In 2 days
- No fasting
- Report time: In 2 days
- No fasting
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Frequently asked questions
Not fully. Past infection, vaccination and other fevers can cause false positives. Blood culture in the first week is more reliable.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 10–34 hours after the sample reaches the lab. You will receive the report online.
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