![]() He/she will check whether the area where you received the shot reacted to the PPD. You must go back to see your doctor after 2 or 3 days. Do not cover the test site with a tape or bandage.To avoid confusing test results, you should pay attention to the following: A small welt or bump will appear and go away after a few hours. The doctor will then give you a shot that contains PPD under your skin’s top layer. To do the positive vs negative TB test, firstly, your doctor will swab the skin on the inner side of your forearm. You have any concerns regarding the test, its risks, or the way it’s performed.Have a rash on the skin that might make it hard to read the test result.Are on medication that affects your immunity (e.g.being around a TB patient, travelled to a country where tuberculosis is common) You’ve been diagnosed with TB in the past. ![]()
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