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Tuberculosis Exposure Screening Indicator

Published: August 9, 2026Updated: August 16, 2026

This test helps determine if you may have been exposed to tuberculosis (TB) bacteria, even if you don’t yet have symptoms.

Quick summary

["A simple screening result to assess potential TB exposure risk."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
39209-2
Short code
TUBERCULOSISEXPOSURESCREENRESULTSINDICATOR
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

This screening uses a qualitative method to detect specific markers associated with TB exposure. It does not measure active TB infection or current illness but flags possible exposure for further evaluation.

Why You Might Need This Test

Your healthcare provider may recommend this test if you’ve had recent contact with someone diagnosed with TB, live in a high-risk area, or have symptoms that could suggest exposure.

What to Expect Before the Test

No special preparation is needed. You may provide a blood sample (whole blood or serum/plasma) depending on the lab’s method. If you’re unsure, ask your provider.

What to Expect After the Test

Results are typically provided as a positive, negative, or indeterminate indicator. Follow-up may include additional testing or a healthcare provider consultation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This screening is not a diagnostic test for active TB but helps identify potential exposure. A positive result prompts further evaluation, such as a TB skin test or chest X-ray, to assess risk.

Short name

TB Exposure Screen

Frequently asked questions

Will this test show if I currently have TB?
No, this test only indicates possible exposure to TB bacteria. Active TB infection requires different diagnostic tests.
What if my test result is positive?
A positive result suggests exposure but doesn’t confirm TB. Your provider will guide next steps, which may include additional tests or monitoring.
Can I get this test at home?
Most screening tests like this are performed in a clinical or lab setting. Check with your provider for availability or alternative options.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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