A member asked:

What does a negative ppd test look like?

A doctor has provided 1 answer
Dr. Michael Ein answered

Specializes in Infectious Disease

See below: A positive PPD is determined by the presence of swelling(induration) around the injection site. Little or no swelling indicates a negative test. Reddness is not used to determine a neg or pos test.

Answered 12/12/2019

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