Clot culture for Salmonella (typhoid)
Quick answer: This test grows Salmonella bacteria, the cause of typhoid and paratyphoid fever, from a blood clot sample. It is used when typhoid fever is suspected, usually in the first week or two of fever.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed; tell staff if you have already taken antibiotics.
How the test is done
- 1Blood is drawn from your arm into a plain tube
- 2The blood is allowed to clot
- 3The clot is placed in a broth that helps Salmonella grow
- 4Any growth is identified and tested against antibiotics
What your results can mean
Reading your report
A positive result confirms typhoid and guides antibiotics; a negative result does not always rule it out.
If the result is outside the usual range
Growth of Salmonella Typhi or Paratyphi confirms typhoid or paratyphoid fever. No growth makes these less likely, especially if no antibiotics were taken before the test.
Who usually has this test
People with fever lasting several days, especially with tummy pain or headache, or after unsafe food or water.
Risks and aftercare
Bruising is possible; keep drinking fluids and follow your doctor's advice while you have fever.
Names and options
Also called: typhoid culture, clot culture, Salmonella culture
Listed by the hospital as
- CLOT CULTURE FOR SALMONELLA
Questions about this test
How is clot culture different from the Widal test?
A culture grows the actual bacteria, while Widal looks for antibodies and can be misleading in India. Culture also shows which antibiotics work.
Why does taking antibiotics first matter?
Antibiotics can stop Salmonella from growing in the lab, giving a negative result. Tell the staff if you have already taken any.
Why is the clot used instead of whole blood?
Separating the clot removes parts of the serum that can slow bacterial growth. Some labs use this method to help Salmonella grow.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.