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 ...

TB diagnosis in children hinges on history of TB exposure, clinical signs and symptoms, tuberculin skin tests (TSTs) or interferon gamma release assays, and radiographic findings.

Medically reviewed by Susan Bard, MDMedically reviewed by Susan Bard, MD Induration refers to the hardening and thickening of the skin, making it firmer than normal. It may occur due to conditions ...

Skin TB Testing: Results will be available within 48 to 72 hours, making it a quick and efficient solution for diagnosing TB. If the induration (swelling) exceeds 5 mm, the patient will be ...

If the induration (swelling) exceeds 5 mm, the patient will be considered TB-infected and prescribed TPT (tuberculosis preventive treatment) medicine. If the reaction is smaller, the patient will ...