What Does An Infected Tuberculosis Skin Test Result Look Like?

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Definition

The PPD skin test is a method used to diagnose tuberculosis (TB). PPD stands for purified protein derivative.


Alternative Names

Purified protein derivative standard; TB skin test; Tuberculin skin test; Mantoux test


How the test is performed

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...

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