The PPD skin test is a method used to diagnose
Purified protein derivative standard; TB skin test; Tuberculin skin test; Mantoux test
The test site (usually the forearm) is cleansed with rubbing alcohol. The PPD extract is then injected under the top layer of skin, causing a welt to form on the skin. This welt usually goes away in a few hours.
The reaction will take 48 - 72 hours to...Read more