Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Tuberculin
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Tuberculin: A protein extracted from Mycobacterium tuberculosis that is used in a skin test to determine if a person has been exposed to tuberculosis. The tuberculin preparation in most common use today is purified protein derivative (PPD) tuberculin. PPD is injected (or multiple-punctured) into the skin. If a reaction is seen at and around the site of injection, the test is positive. The PPD tuberculin test done by intradermal injection is also known as the Mantoux test.
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