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About the test
What is this test done for?

It is a simple and rapid serological diagnostic test to identify IgM antibodies against Salmonella typhi, in typhoid fevers.

Why is it Done?

Typhoid fever has been endemic in India and other developing countries.   After one gets infected with the organism, it takes about 7 to 10 days before a Widal test can diagnose it. There is therefore a continuous need for a simple test which can be carried out in small laboratories for rapid diagnosis of typhoid in these countries. Typhi dot IgM test has been introduced to detect IgM antibodies against Salmonella typhi.

When should it be performed?

The test should be performed if the patient shows following signs and symptoms:

  • Slow progressing fever
  • Gastroenteritis
  • Profuse sweating
  • Headache
  • Malaise
  • Cough
  • Distended abdomen
  • Enlarged spleen and liver
How is it done

A blood sample will be collected from a vein in your arm. The patient does not have to be fasting for doing the test.

The test is usually combined with IgG results:
  • If IgM line is positive: it suggests acute typhoid fever.
  • If IgM and IgG are positive: it also suggests acute typhoid fever.
  • IgM negative and IgG positive: it could mean that there is past infection.
Other Tests

The spot test just diagnosis the presence and absence of antibodies for Salmonella typhi. A detailed report can be obtained by doing a Widal test at appropriate time.

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