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Best Answer: ilovemikedirnt, The TB skin test is also referred to as Purified Protein Derivative; PPD; Mantoux; Latent tuberculosis infection test. A healthcare worker will interpret your test results by looking at the injection site on your forearm at 48 or 72 hours.
A positive response to a TB skin test does not mean that you have active TB. Rather it means that you have been exposed to TB and need further evaluation. A TB test is performed by injecting a small amount of fluid that contains components of the TB organism under the skin. If a patient has been exposed to TB before or has received the BCG vaccine, the patient will react to the injection by forming a hard, raised area at the injection site.