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Clinical Laboratory Test:
body — tuberculosis skin test

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Description

The Tuberculosis Skin Test (TST) is a simple, safe, and effective way to detect tuberculosis (TB) infection. It is also known as the Mantoux test. The test involves injecting a small amount of purified protein derivative (PPD) into the skin of the patient's forearm. The patient's arm is then observed for a reaction over the next 48 to 72 hours. If the patient has been infected with TB, a raised, red, itchy bump will appear at the injection site.

To obtain the TST, a healthcare provider will use a sterile needle to inject a small amount of PPD into the patient's forearm. The patient should remain still during the injection and may feel a slight pinch or sting. After the injection, the healthcare provider will cover the injection site with a bandage and instruct the patient to return in 48 to 72 hours for evaluation. During the follow-up visit, the healthcare provider will examine the injection site for any signs of a reaction. If a reaction is present, the healthcare provider will measure the size of the reaction and record the results.

Synonyms
  • Mantoux screening test
  • Mantoux test
  • Pirquet test
  • PPD skin test
  • TB skin test
  • TB test
  • tuberculin sensitivity test
  • tuberculin skin test
Some Diseases Associated with an Abnormal Tuberculosis Skin Test
Detailed Laboratory Testing Information (use the custom search buttons below to find details on these topics)

All of the following must be considered when interpreting clinical findings and are too extensive to be covered on this site: