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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is It Normal To Feel Itching Even Tough The PPD Test Is Negative?

I had my PPD test on 27 th dec n its result on 29 th of dec but i can still feel itching n redness enough though my test is negative...IS this normal or do i need to see a doctor?
can i hv my 2nd ppd after a week of Varricella vaccine or ha sto be on same day or after 4 weeks?
Mon, 1 Sep 2014
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Pathologist and Microbiologist,  's  Response
Hi!
welcome to HCM!
There is a very small risk of severe redness and swelling of the arm in people who have had a previous positive PPD test and who have the test again. This reaction can also occur in a few people who have not been tested before.
A negative reaction usually means you have never been infected with the bacteria that cause TB.

With a negative reaction, the skin where you received the PPD test is not swollen, or the swelling is very small. This measurement is different for children, people with HIV, and other high-risk groups.

The PPD skin test is not a perfect screening test. A few people infected with the bacteria that cause TB may not have a reaction. Also, diseases or medicines that weaken the immune system may cause a false-negative result.
Hope this helps!
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Is It Normal To Feel Itching Even Tough The PPD Test Is Negative?

Hi! welcome to HCM! There is a very small risk of severe redness and swelling of the arm in people who have had a previous positive PPD test and who have the test again. This reaction can also occur in a few people who have not been tested before. A negative reaction usually means you have never been infected with the bacteria that cause TB. With a negative reaction, the skin where you received the PPD test is not swollen, or the swelling is very small. This measurement is different for children, people with HIV, and other high-risk groups. The PPD skin test is not a perfect screening test. A few people infected with the bacteria that cause TB may not have a reaction. Also, diseases or medicines that weaken the immune system may cause a false-negative result. Hope this helps!