3 doctors weighed in:

How is the PPD skin test measured?

3 doctors weighed in
Dr. Ally-Khan Somani
Dermatology
2 doctors agree

In brief: Size of induration

The tuberculosis skin test (PPD) is measured between 48-72 hrs after placement.
The area of induration (palpable, raised, hardened area) around the site of injection is measured and this represents the reaction to tuberculin.

In brief: Size of induration

The tuberculosis skin test (PPD) is measured between 48-72 hrs after placement.
The area of induration (palpable, raised, hardened area) around the site of injection is measured and this represents the reaction to tuberculin.
Dr. Ally-Khan Somani
Dr. Ally-Khan Somani
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