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Widal (Slide Method)
Investigation Result Biological Reference Interval

Salmonella typhi O (TO) 1:80 < 1:80
Salmonella typhi H (TH) 1:160 < 1:80
Salmonella paratyphi A, H (AH) No Agglutination seen < 1:80
Salmonella paratyphi B, H (BH) No Agglutination seen < 1:80
Impression: Positive

• Sample Type: Serum • Method: Slide Agglutination • Comments: 1. Titres 1:80 and above of “O” antigen & 1:160 and above of “H” antigen are significant 2. Rising titres are significant 3. The recommended Widal test is by Tube Agglutination Method • Disclaimer : 1) The above result relate only to the specimens received and tested in laboratory and should be always correlate with clinical findings and other laboratory markers. 2) Improper specimen collection, handling, storage and transportation may result in false negative/Positive results.

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