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FAQs

What is a 2 TB test? ›

Information on Two-Step TB Skin Test

The two-step PPD test is used to detect individuals with past TB infection who now have diminished skin test reactivity. This procedure reduces the likelihood that a boosted reaction is later interpreted as a new infection.

If the first TB skin test result is negative, a second TB skin test should be done 1 to 3 weeks later. If the second TB skin test result is positive, it is probably a boosted reaction. Based on this second test result, the person should be classified as previously infected.

The test may be done at any local health department, primary care clinic, doctors office, CVS, Walgreens etc.

Although the booster effect can last up to one year, an interval of one to four weeks between TSTs is recommended to avoid confusion in case of actual exposure to infectious tuberculosis disease. A two-step TST needs to be performed only once if properly administered and documented.

Best practice indicates that a two-step tuberculin skin test (TST) involves two tests performed within one to four weeks of each other. The second test can be completed up to one year from the first test, provided there has not been an exposure to infectious tuberculosis (TB) disease during that time period.

Tuberculosis is an infectious disease that can cause infection in your lungs or other tissues. It commonly affects your lungs, but it can also affect other organs like your spine, brain or kidneys. The word “tuberculosis” comes from a Latin word for "nodule" or something that sticks out.

How many gigabytes or megabytes are in a terabyte? Put simply, 1 terabyte (TB) equals 1,000 gigabytes (GB) or 1,000,000 megabytes (MB). In the case of 2TB, 2 terabytes (TB) equals 2,000 gigabytes (GB) or 2,000,000 megabytes (MB).

There are currently two methods for detecting tuberculosis infection: The Mantoux tuberculin skin test (TST) and an Interferon Gamma Release Assay (IGRA) blood test. Patients must be carefully assessed for risk factors PRIOR to administration of either test.