15-mm induration finding needs further evaluation by a nurse who is assessing the injection site of a client who has received a purified protein derivative test.
A skin test to detect tuberculosis is known as a pure protein derivative (PPD).
The test is negative if, 48 to 72 hours after the PPD injection, there is no swelling or only a small swelling where the injection was made. If the test yields a negative result, you most likely haven't been exposed to the bacteria that cause TB.
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