Widal Test – Reference Range

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Normal value of widal test only a titre above 1:80 should be considered as significant.

A rising titre (done each week) is considered to be definite evidence of infection.

A single widal test holds little clinical applicability due to the several cross-reacting infections, which include malaria.

If other tests, such as a more precise serology or bacteriologic culture, are unavailable, then inferences such as a fourfold rise in the titre (for example from 1:30 to 1:120) during the course of an infection, or a change from an IgM reaction of a specific titre to an IgG reaction of the same titre in the least, would signify a typhoid infection.

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