Here are some potential explanations for a positive TB test:
#Normal negative tb test pictures skin
A follow-up chest x-ray or sputum culture may need to be completed to confirm a positive result from either the skin or the blood test. A positive blood test indicates that a person is either currently infected or has been infected with TB bacteria in the past. The TB blood test, on the other hand, measures whether a person’s white blood cells will react to TB bacteria.
A health care provider then "reads" the site of injection for signs of a positive reaction 48 to 72 hours later. The skin test will help to determine whether a person has ever been exposed to the TB protein by injecting a small bubble of fluid with purified TB protein (which doesn’t cause illness) into the skin of the forearm. While a positive TB test might naturally conjure up alarming images, it might also reassure you to know that modern treatment options are available.įirst, it might be helpful to clarify that there are two different types of TB tests: the tuberculin skin reactivity test (also called the Mantoux Test) and the TB blood test. However, a positive test doesn’t necessarily mean that they’ll have an active infection - there are several situations in which someone might test positive without ever having symptoms (more on that later). So yes, once exposed, a person will always have a positive test that reflects the history of that exposure.
TB or not TB: that is the question! A person who tests positive for tuberculosis (TB) has likely been exposed (at some point in their lives) to either Mycobacterium tuberculosis (the organism that causes infectious TB) or protein from the bacterium.
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