Description
Tuberculin Time Test (mantoux)
Sample Type: Contact Lab
Tests Included:
Tuberculin skin test (Mantoux Test)
Sample Required:
Intradermal injection of purified protein derivative (PPD) tuberculin solution into the forearm
Test Time:
Results are typically read 48 to 72 hours after the injection.
Test Range Values:
The test result is measured in millimeters of induration (raised, hardened area) at the injection site.
What is the test?
The Tuberculin Time Test, commonly known as the Mantoux Test, is a screening method for tuberculosis infection. A small amount of PPD tuberculin is injected under the skin, and the reaction (induration) is measured after 48 to 72 hours. A positive reaction indicates exposure to tuberculosis bacteria.
Test Procedure:
A healthcare provider administers the test by injecting a small amount of PPD tuberculin solution into the forearm. The injection site is examined for induration 48 to 72 hours later.
When to take the test:
When a healthcare provider suspects tuberculosis infection or when screening individuals at risk for exposure to tuberculosis, they may order the Mantoux Test.
Who should take the test:
Individuals at risk of tuberculosis exposure, close contacts of known tuberculosis cases, healthcare workers, and individuals with certain medical conditions may require this test for screening and diagnosis.
Precautions for exceptional cases (pregnancy, etc.):
The Mantoux Test is generally considered safe during pregnancy. Pregnant individuals should inform their healthcare provider about their pregnancy status before undergoing the test.
Frequently Asked Questions (FAQs) for Tuberculin Time Test (Mantoux Test):
Q1: Can the Mantoux Test diagnose active tuberculosis?
A: No, the Mantoux Test cannot differentiate between latent and active tuberculosis infections. A positive reaction indicates exposure to the bacteria but does not confirm active disease. Further diagnostic tests, such as chest X-rays and microbiological tests, are needed for a definitive diagnosis.
Q2: What can cause a false-positive Mantoux Test result?
A: Certain vaccinations (such as Bacillus Calmette-Guerin or BCG vaccine) and previous exposure to non-tuberculosis mycobacteria can cause false-positive results. Healthcare providers consider these factors when interpreting the Mantoux Test.
Q3: Is the Mantoux Test safe for individuals with compromised immune systems?
A: The Mantoux Test is generally safe for most individuals, including those with compromised immune systems. However, healthcare providers assess the overall clinical context and consider other diagnostic methods in individuals with weakened immune responses for accurate tuberculosis screening.
*Please note that specific testing protocols and guidelines may vary based on the latest recommendations from health authorities and regulatory agencies. It is essential to consult healthcare professionals and follow local testing guidelines for accurate and appropriate testing.
