A positive tuberculosis (TB) skin test can look different depending on your risk factors. Learn risk factors to consider and what a positive test may look like.

When checked by a healthcare professional, "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

When checked by a healthcare professional, "an induration on the skin of 15 millimeters or more is usually considered a positive TB result in healthy individuals," says Doyle.

A healthcare worker then assesses the injection site 48 to 72 hours later to check for a reaction, such as a skin bump, also called a skin induration. A TB skin test is not 100% accurate ...

A 44-year-old man who recently immigrated from Peru is found to have induration of 16 mm on a tuberculin skin test. He received bacille Calmette–Guérin vaccine as an infant and is asymptomatic.

Results from two phase 3 clinical trials recently demonstrated that a new tuberculosis skin test was safe, easy to use and comparable in accuracy to an interferon gamma release assay. The C-Tb ...

The lifetime risk of reactivation tuberculosis is 20 percent or more among most persons with induration of 10 mm or more on a tuberculin skin test and either human immunodeficiency virus infection ...

July 23, 2012 — A negative tuberculin skin testing (TST) result, as defined by a reaction of less than 5 mm of induration by Mantoux testing, is strongly predictive of active tuberculosis (TB ...