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Types of TB test. There are a range of tests to show if you have TB, such as a sputum test, a culture test and x-rays. Chest x-ray. A chest x-ray can show damage in your lungs, but you might need further tests to prove you have TB, such as sputum and culture tests or scans.
How long do you have to wait to read a tb test. TB skin tests should be read between 48 and 72 hours after the injection when the size of the induration is maximal. Tests read after 72 hours tend to underestimate the size of the induration. ChaCha on! [ Source: http://www.chacha.com/question/how-long-do-you-have-to-wait-to-read-a-tb-test ]