Tuberculosis test!!??

i got a tuberculosis test done yesterday the one where they inject you right under the skin. well i was just wondering what is normal and what is not normal. what do they look for if you have tb. like i want to know what to look for so i no if i have it or not because i am paranoid when it comes to these things. and another question i thought the tb test was a four pronged thing. if its not do you know what test that is?? any help would be wonderfull thanks.

The four prong test is not used anymore. A positive test will develop a welp around the site and usually become red. A small bump and slight red appearance is to be expected. The redness, because you have aggrevated the skin, and the bump because they are actually injecting a very minimal amount of inactive TB under the skin. When you have been exposed to TB your body produces specialized "T CELLS" to try to fight it off. If, after having the skin test, the site becomes hard and raised, it is because your body detects the TB bacterium and is sending these specialized cells to the site.

The TB test is a simple injection of a preservative under the skin. The test gets read 48-72 hours after the injection. An abnormal test, I haven't seen one in person but I do know what to look for, is a raised bump at the injection site. It could also be slightly discolored. Do not worry if the test is slightly raised. The bump has to be taller than a certain measurement. It is actually very difficult to get TB unless you have had a prolonged exposure to someone with active TB. I'm sure this is just a quick formaility, don't worry.