TB Gold Blood Test
Below is a plain-language overview of the tb gold blood test. The TB Gold Blood Test is a blood test used to check whether you have been infected with the bacteria that cause tuberculosis (TB). It is often ordered when a person has symptoms of TB, has been in close contact with someone with TB, or needs screening for work, school, or travel.
- Sample type
- blood
- Category
- General Wellness
- Turnaround
- 1-3 business days
- Price
- $199
- Referral
- Not required
The TB Gold Blood Test is a blood test used to check whether you have been infected with the bacteria that cause tuberculosis (TB). It is often ordered when a person has symptoms of TB, has been in close contact with someone with TB, or needs screening for work, school, or travel.
What it measures
- TB-specific antigens — Proteins from the TB bacteria that trigger a response if you have been infected.
- Interferon-gamma (IFN-γ) — A substance made by your immune cells when they recognize TB antigens.
- Mitogen control — A positive control to show your immune cells are working properly.
- Nil control — A negative control to check for background noise in the test.
Who it is for
This test is typically ordered by primary care doctors, infectious disease specialists, or occupational health providers. It is commonly used for people who have symptoms of TB, have been exposed to TB, or need screening before starting certain jobs or treatments.
Preparation
No fasting or special preparation is needed for this test. You can eat and drink normally before your blood draw.
Results and what they mean
Results are usually reported as positive, negative, or indeterminate, along with the measured levels of interferon-gamma. A positive result means you have been infected with TB bacteria, but it does not tell whether you have active TB disease or a latent infection. Only a clinician can interpret your results in the context of your health history and other tests. This information is not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the tb gold blood test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Does a positive result mean I have active TB?
No. A positive result only shows that you have been infected with TB bacteria. It cannot distinguish between latent TB infection (where you are not sick and not contagious) and active TB disease. Your doctor will do further tests to find out.
How is this test different from a TB skin test?
The TB Gold blood test requires a single blood draw and does not need a follow-up visit. A TB skin test requires two visits and can be affected by prior BCG vaccination, while the blood test is not.
Can I get TB from this test?
No. The test uses synthetic proteins from the TB bacteria, not live bacteria, so there is no risk of getting TB from the test.
What if my result is indeterminate?
An indeterminate result means the test could not give a clear answer, often because your immune cells did not respond as expected. Your doctor may repeat the test or order other tests.