Tuberculosis Exposure Screening Follow-Up Test (Qualitative Immunoassay for Mycobacterial Antibodies)
This test checks if your body has developed antibodies to tuberculosis (TB) bacteria after potential exposure, helping monitor your follow-up care.
["This test helps track whether your immune system responded to TB exposure and guides ongoing medical decisions."]
Key facts at a glance
- LOINC
- 39210-0
- Short code
- TUBERCULOSISEXPOSURESCREENFOLLOWUPSTATUS
- Synonyms
- —
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- cphs
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you’ve had recent contact with someone with active TB, received TB preventive treatment, or are in a high-risk group for TB exposure. It helps determine if your body has mounted an immune response to prevent infection.
What to Expect Before the Test
No special preparation is needed. You may have a blood draw from a vein in your arm. The test involves a small needle, and you’ll feel a brief pinch. If you’re nervous, let your provider know—some people use numbing cream or distractions.
What the Test Measures
This test detects antibodies in your blood that your immune system produces in response to TB bacteria. Antibodies are proteins that help identify and fight foreign substances, like germs. The presence of these antibodies suggests your body has been exposed to TB (even if you don’t have active disease).
What the Results Mean
Results are qualitative (positive/negative) rather than a number. A positive result means your body likely reacted to TB exposure, but it doesn’t confirm active TB. Follow-up care, such as further testing or treatment, will depend on your clinical situation and provider’s guidance.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result indicates your immune system has detected TB exposure, which may mean you’re at risk for latent TB infection (LTBI)—a condition where the bacteria are inactive but could become active. This helps healthcare providers tailor preventive treatment or monitoring to protect your health. A negative result means no detectable antibodies, but it doesn’t rule out past exposure or active TB without additional testing.
Short name
TB Exposure Screening Follow-Up
Frequently asked questions
Will I need to do anything special after the test?
What does a positive result mean for my health?
Can I get TB from this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy