IGRA test

The IGRA test (i.e., Interferon Gamma Release Assay) is a blood test capable of determining whether a person is infected with tuberculosis. There are no risks in undergoing the IGRA test.

Why do this test?

A Mantoux test indicates that you could be infected with tuberculosis. Greater clarity can be obtained with the IGRA test (possibly in combination with X-ray photos).

How does the test work?

You go to one of the three hospitals in the Zuid-Limburg region for a blood test. Your blood is tested at the laboratory for the presence of antibodies against tuberculosis. You receive the test results by letter or by e-mail 2 to 3 weeks later. Depending on the results, we may ask you to contact the Public Health Service again for a follow-up appointment.

The results are positive

If the IGRA test rest is positive, it is highly probable that you are infected with tuberculosis. There are 2 possibilities:

You are infected, but not (yet) ill (a latent or hidden contamination).
You could have tuberculosis, additional examination is required.

The results are negative

If you test negative, infection is unlikely, though this is not absolutely certain. How the TB doctor interprets the results will depend in part on your (medical) anamnesis. The doctor will discuss further procedures with you.

Any further questions?

If you have any other questions about the IGRA test, you should contact the Public Health Service tuberculosis control team.