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Tuberculosis (TB) Status Test

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

This test helps determine whether you have active tuberculosis (TB) infection or exposure. It may include blood or other tests to check for TB markers.

Quick summary

["TB status tests help doctors identify potential infection early for proper treatment."]

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

Key facts at a glance

LOINC
45241-7
Short code
TB status
Synonyms
TB status
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
reported
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 Does This Test Measure?

TB status tests typically check for TB-specific antibodies or markers in your blood or other body fluids. For example, a blood test might detect TB-related proteins or immune responses. Some tests may also evaluate lung function or other indicators of active TB infection.

When Might You Need This Test?

You may need a TB status test if you have risk factors like recent travel to high-risk areas, weakened immune system, exposure to TB, or certain health conditions. Healthcare providers may also recommend it for people with symptoms like persistent cough, fever, or weight loss.

What to Expect Before the Test

Most TB status tests require a simple blood draw or other specimen collection. Some tests may involve a chest X-ray or additional procedures if active TB is suspected. Follow your doctor’s instructions about fasting or avoiding certain medications if applicable.

What to Expect During the Test

The process is usually quick and painless. Blood is drawn from a vein in your arm, or other fluids may be collected via swabs or other methods. You may feel slight discomfort, but it should resolve quickly.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

TB Screening/Confirmation

Frequently asked questions

How long does it take to get results?
Results can vary. Blood-based TB tests (like TB-specific antibody tests) may take days to a few weeks. Some rapid tests (e.g., interferon-gamma release assays) can provide results in hours or days. Always follow up with your healthcare provider for guidance.
What does a positive or negative result mean?
A positive result may indicate past TB exposure or infection, but it doesn’t always mean active disease. A negative result suggests no current TB infection, but exposure history should still be considered. Your doctor will interpret results in context with your symptoms and medical history.
Can lifestyle changes affect TB test results?
Yes, certain factors like recent TB exposure, immune status, or underlying health conditions may influence results. Avoiding recent TB exposure or managing conditions like diabetes or HIV can improve accuracy. Always discuss your lifestyle with your healthcare provider before testing.
  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