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What is a TB skin test?
A TB skin test doesn't collect a sample from the patient, but instead doctors inject material obtained from the bacteria that causes tuberculosis into the skin. The material used is called PPD (purified protein derivative). Results can be read after 48 or 72 hours after the injection is given.
TB Skin Test Overview
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What does it mean to have abnormal TB skin test?
An abnormal or positive result on a TB skin test indicates the patient has some form of tuberculosis even though s/he may never have had symptoms.
Click here for more information on a postive test result. Click here to see what a positive reaction to the test looks like. (Note: the TB skin test results are on the right arm.)
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Possible causes/diagnosis:
Mycobacterial meningitis
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