Widal Test (Tube Agglutination)
Test code: SER0481
- Preparation
- No special preparation
- Report
- Same Day
- Processed
- Mon to Sun, by 05:00 PM
About this test
The Widal Test checks your blood for antibodies against the bacteria that cause typhoid and paratyphoid fever (Salmonella Typhi and Paratyphi). It is commonly used, along with your symptoms, to help diagnose typhoid in people with a fever lasting several days.
Preparation & sample
No special preparation required. Tell us how many days you have had fever and whether you have taken any antibiotics or had a typhoid vaccine.
What does this test measure?
It measures antibodies against parts of the typhoid bacteria, usually reported as TO, TH, AH and BH with a titre for each, such as 1:80 or 1:160. A higher titre means more antibody. The tube method used here gives a measured titre, which is more reliable than a quick slide test.
When should you get this test?
- Fever that has lasted more than 5 to 7 days, often rising step by step
- Headache, weakness, loss of appetite, stomach pain, constipation or diarrhoea with fever
- After eating outside food or drinking unsafe water, when typhoid is suspected
- As advised by your doctor alongside a CBC and other fever tests
Understanding your results
- Antibodies usually appear towards the end of the first week of fever, so a test done too early may be negative even if you have typhoid.
- A high titre, especially of TO and TH, supports typhoid, but a single result can be misleading. In India, many people have some antibodies from past infections or vaccination.
- A fourfold rise in titre between two samples taken about a week apart is the most reliable sign of a current infection.
- In the first week of fever, a blood culture is the most accurate test to confirm typhoid.
Your doctor will read the Widal result together with your symptoms and other tests before starting treatment.
Frequently Asked Questions
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How Home Collection Works
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- 2
We come to you
A trained phlebotomist collects your sample at home.
- 3
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Your sample is processed at one of our trusted labs.
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