Tuberculosis Blood Test

Tuberculosis Blood Test

The TB test detects immune response to tuberculosis bacteria (Mycobacterium tuberculosis) in your body. It’s intended for those who have been exposed to TB, have a high risk for contracting TB, or require evidence of a negative TB test result. Read more
Test details

Sample type:
You do not need to do anything special to prepare for the sample collection. Fasting is not required for this test.
Test type: In Person
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+ $6.00 Physician Service Fee
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What Icon
Detect Mycobacterium tuberculosis, the bacteria that causes Tuberculosis (TB). This is detected in both active TB and latent TB.
Who Icon
Must be 18+ years of age to purchase.
How Icon
Schedule an appointment, then visit one of the Quest Diagnostics Patient Service Centers
About the Test

This is an Interferon-Gamma Release Assay (IGRA) TB blood test that detects the immune system’s response to tuberculosis bacteria (Mycobacterium tuberculosis attack the lungs but can also attack any part of the body (e.g., spine, kidneys, brain). Not all TB bacteria infections result in sickness. As a result, two TB-related conditions exist: latent TB infection (LTBI) and TB disease. If not treated properly, TB disease can be fatal.

LTBI is a carrier state of TB that can last for weeks, months, or years before developing into TB disease. Active TB is when tuberculosis bacteria overwhelm a person's immune system, and symptoms start to appear. While it does not differentiate between LTBI and active TB disease, this tuberculosis blood test detects the immune response to TB bacteria which can be the first step in diagnosing either condition. Further testing may be required if the blood test is positive.

With Quest®️, you can buy a TB blood test online and get testing at a nearby location – no doctor’s visit required.


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