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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.
The PPD asseses whether you have had a TB infection. If not, and you are infected tomorrow your test will change to positive after a period of time. So the test is only good the day it is done. In brief: Depends. The PPD asseses whether you have had a TB infection.