Can a positive Tuberculosis test result show after the usual 2-3 day timespan?

Question:

I have never tested positive for a TB test. I had one done a month ago, and I noticed a little bump in the area where I had the test done, but this just showed up now. I am not sure if this is the exact spot where I had the test done, and when I first got it done and read, the test was negative. I just had some redness in the area, but that is not a sign for being positive. I plan on going to the MD tomorrow, but is this common?

Answers:
PPD test is usually read after 48-72 hours. Redness, induration or itchiness may be seen and manifested after several hours. Go to your MD and have the bump seen because it seems to be impossible that such was cause by your TB test.

A positive TB test is an immune response to the material that was injected. It takes the body 48 hours to produce the appropriate response, which is usually a welt. If you didn't have a reaction within 48-72 hours, you are most likely TB negative. Sometimes the injection itself can cause some bruising/redness which can cause a little lump in time. I would double check with your MD, as TB isn't something to mess around with, but my guess it that you're absolutely fine.

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Can a positive Tuberculosis test result show after the usual 2-3 day timespan?

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