Interferon Gamma Release Assay

**Semantic type:** Laboratory Procedure

**Definition:** A blood test that exposes a person's T-lymphocytes ex vivo to specific microbial antigen(s) to stimulate the production and release of interferon gamma, which provides an indication that the person has been exposed to a specific microbe.

**Synonyms:** - IGRA - IGRA - INTERFERON GAMMA RELEASE ASSAY