How big does tb test need to be to get positive?!
Question: tb test
Answers: tb test
its not how big it gets, its if its still there
After about three days (72hr) if its still raised or has a different color (like a rash) its positive.
negative means its gone.
When you get a tb test on your arm, any rash whatsoever that comes back, no matter how large or small (Even the size of a dime), is considered positive.
This does not mean that you necessarily have TB right now, but simply that you carried the virus in the past and it is dormant in your body.
Good luck.