A member asked:

How do i know exactly what is a tb negative skin test?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

+ PPD: This means that there was minimal induration on a PPD that is read 48 to 72 hours after administered. The PPD is likely to be + in someone who has been exposed to TB before or if they were previously given bcg. It is likely to be - in someone who does not fit into those categories.

Answered 6/10/2014

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