Getting a 2 Step PPD Test: The Process - Statcare
Feb 15, 2019 · In a typical test, a doctor injects a small amount of purified protein derivative (PPD) into a patient. After a few days, the doctor will measure the size of the reaction your skin has to the injection in order to diagnose you. If you’ve had TB in the past, it’s likely that your skin won’t react at all, sometimes resulting in a false negative.
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