WIDAL SCREENING TEST
Pre-test preparation or requirements
• Sample can be drawn at any time. No fasting or special preparation required.
• Sample should taken in plain vial.
Significance of test
Sera from normal individuals may show agglutination in dilutions up to 1:40 Agglutination titers of 1:40 or more are significant and rising titers on repetition of test after few days is more suggestive of enteric fever.
LIMITATIONS OF WIDAL TEST:
Numerous false positives due to cross reacting antibodies and heterospecific anamnestic responses and false low titers as a result of partial treatment are observed. This makes clinical correlation with lab findings mandatory.