Lung Infections

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Lung Infections Guide

Alison Beaver

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ask: If I need a second TB shot how long do I have to wait to get another one done?

By Anonymous

I had a TB shot done but waited to long to have it checked now I have to redo it so how long do I ha e to wait to have it
redone?

Add a Comment2 Comments

Susan Cody HERWriter Guide

Hi Anon

Thanks so much for your question. When did you get the first test?

Generally you can go ahead and get the test done again now - there is no "waiting period" and remember to get it checked within 72 hours. However, a repeat test can sometimes affect the result so make sure you mention that you had a recent test. According to some sources, repeat testing can make one look like they have a positive result (or having a "booster" effect). If you are not American, the BCG vaccination can do the same thing.

Good luck!

December 12, 2009 - 2:47pm
Evie (reply to Susan Cody)

I had it done on 12-5-09 and went back on 12-12-09 to have it
checked and was told I waited to long , now I have to wait two weeks to have it redone again

December 12, 2009 - 6:27pm
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