A member asked:

Ppd skin test, negative, no reaction and swelling (72 hrs). the test was taken in last tuesday morning, 9am, now it gets swelling and itch. positive?

A doctor has provided 1 answer
Dr. Michael P Vaughn answered

Specializes in Allergy and Immunology

Delayed onset ppd: This could represent a positive reaction. Their is a besst confirmatory test called a quantiferon-gold test which is a gamma-interferon release assay for tb. It has some limitations but if positive is very accurate for diagnosis, ask an infectious disease specialist about this if your pcp does not know about this test.

Answered 9/28/2016

4.5k views

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