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infectious
Widal Test (Typhoid)
Widal· also: Typhoid Test, TO, TH
Clinical Overview
The Widal test detects antibodies against Salmonella typhi antigens. A fourfold rise in titer is significant. Used widely in endemic areas but has limitations in sensitivity/specificity.
Reference RangesWHO/IFCC standards
| Reference Range | Unit | Notes |
|---|---|---|
| < 1:80 | titer | O antigen <1:80; Significant ≥1:160 (endemic areas may need ≥1:320) |
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Related Topics
typhoidSalmonellafeverenteric fever