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TB Skin Test (Tuberculosis)

What is it?

A test that can help show if someone has been exposed to tuberculosis previously or are currently affected.

How is it done?

A small amount of tuberculosis protein is injected under the skin, and 48-72 hours after the swelling is measured. Redness and the hard lump are your body's reaction to the antigen protein. This is safe and some people have this test done every year.

Who needs it?

Call it what you want

Purified protein derivative (PPD) testing, Mantoux testing, Tuberculin Skin test (TST) - these are all the exact same test.

Getting ready

In general, you don't have to prepare for test unless your health care provider tells you to.


Because of 48-72 hour time frame to read the test, we will book you with a second appointment to ensure accuracy of your results.

People who are at a high risk of TB exposure (ie. working in a hospital or clinic) or employment purposes or school admission requirements.

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