Widal test is a blood test that helps in diagnosing enteric fever (typhoid fever and paratyphoid fever), which is caused by consuming contaminated food and drinks. The serum agglutination test is a part of the widal test. People with typhoid fever have homologous antibodies present in their blood. The widal test is performed by using either the slide method or the test tube method.
Read further to know more about the widal test in Delhi, including test price and cost, preparation, understanding test results, etc.
A widal test is done if you develop the following symptoms:
The widal test is used for detecting antibodies in the blood against two antigens (O & H) of Salmonella enterica, the typhoid-causing bacteria. Agglutination refers to the clumping of particles that happens when an antigen gets mixed with its antibody. When this test is done using a slide, it is called slide agglutination. Similarly, when it is done using a test tube, it is called tube agglutination. Generally, tube agglutination is used more frequently than slide agglutination in the widal test. Apart from Salmonella Typhi antigens “H” and “O”, S. Paratyphi antigen “H” is used in this test.
One week after developing the typhoid fever, the antibodies against Salmonella antigens “O” and “H” usually appear in the serum. Another widal test can be done 7-10 days after the first one to examine the levels of antibodies.
No side effects are associated with a widal test, although, for a few days, some pain might be felt in the area from where the blood is taken using a needle.
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The widal test is performed to check for enteric fever (typhoid and paratyphoid fever).
There are usually no preparations required for the widal test. However, before the test, for accurate diagnosis, do inform your doctor if you have ever contracted typhoid fever before, come in contact with someone who has the fever, or got vaccinated against the same. Also, do let him/her know if you have ever gotten infected with malaria as well.
A widal test is done by withdrawing a blood sample from your vein through the use of a needle. It can be performed at a preferred clinic, hospital, or a laboratory. Home test sample collection facilities are also available.
Reference Range: If the widal test result for antigen O and antigen H is greater than or equal to 1:80, it means that you have typhoid fever.
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