the one that is only to determine if you have it or don't
Skin Conditions - 2 Answers
Random Answers, Critics, Comments, Opinions :
1 :
they inject you with a tuberculin injection just under the skin and in 2 -3 days you go have it read. It's positive if you there is a red bump the size of a pencil eraser or bigger on your arm.
2 :
the ppd test is just a small injection on your forearm, the results can be "read" within 2-3 days. A postive reaction will be an area of inflammation at the injection site (round bump). It doesn't hurt and as long as you are ok w/ needles you will be fine
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