Tuberculosis Exposure Screening (Recency) – Antibody Test
This blood test checks for recent exposure to tuberculosis (TB) bacteria by detecting antibodies that develop after infection.
["This test helps determine if you may have been recently exposed to TB bacteria, even if you don’t yet have symptoms."]
Key facts at a glance
- LOINC
- 39211-8
- Short code
- TUBERCULOSISEXPOSURESCREENFINDINGRECENCY
- 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
What This Test Measures
The test looks for specific antibodies in your blood that your immune system produces in response to TB bacteria. These antibodies indicate a recent infection, typically within the past few months to a year. The presence of these antibodies suggests exposure but does not confirm active TB disease.
Why You Might Need This Test
Healthcare providers may recommend this test if you’ve had recent contact with someone with active TB, live in a high-risk area, or are part of a group at higher risk for TB exposure (e.g., international travelers, certain healthcare workers, or individuals with weakened immune systems).
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw a blood sample. The process usually takes a few minutes, and you may feel a brief pinch. If you’re pregnant, have a bleeding disorder, or take blood-thinning medications, let your provider know before the test.
What to Expect After the Test
After the blood draw, you may experience mild bruising, swelling, or soreness at the injection site. Apply a clean, cold, damp cloth to help reduce discomfort. Avoid heavy lifting or strenuous activity for the rest of the day. If you experience excessive bleeding, severe pain, or signs of infection (e.g., increasing redness, warmth, or pus), contact your provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
TB Exposure Screening (Recency)
Frequently asked questions
This test is not used to diagnose active TB but helps identify recent exposure. If antibodies are found, further evaluation (such as a TB skin test or chest X-ray) may be needed to assess risk of infection or disease progression. Positive results do not mean you have TB; they indicate potential exposure that your body has responded to.
Results are typically available within 1 to 3 business days. Your healthcare provider will discuss the findings with you during a follow-up visit.
Yes, this test is often recommended for individuals with weakened immune systems due to conditions like HIV, chemotherapy, or organ transplants, as they are at higher risk for TB infection.
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