There is a tuberculosis (TB) blood test, also called an Interferon Gamma Release Assay or IGRA. It's 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.
It must work on animals because pasteurised milk, back in the 1950's, was always tested for TB. The bottle top on the milk confirmed the testing.