Mantoux test

The Mantoux test, also known as the tuberculin skin test, is used to determine if someone has been exposed to the bacteria that cause tuberculosis (TB). A small amount of a purified protein derived from the TB bacteria is injected under the skin of the forearm. After 48 to 72 hours, a healthcare professional checks the injection site for swelling or redness. A positive result indicates previous exposure to TB, but further testing is required to confirm if a person has active TB. The test is simple and helps in TB screening and prevention strategies.