what is a interferon-gamma release assays blood test for
The tuberculosis (TB) blood test, also called an Interferon Gamma Release Assay or IGRA, is a way to find out if you have TB germs in your body.The TB blood test can be done instead of a TB skin test (Mantoux).There are two kinds of TB blood tests:he tuberculosis (TB) blood test, also called an Interferon Gamma Release Assay or IGRA, is a way to find out if you have TB germs in your body.