At a Glance
Why Get Tested?
To screen for tuberculosis (TB)
When to Get Tested?
When you have a high risk of exposure to TB; sometimes as part of an examination prior to starting school or a new job (such as a college student, teacher, or daycare employee); when you have signs and symptoms consistent with TB
For a tuberculin skin test, no sample is required. A small amount of purified protein derivative (PPD) solution is injected just under the first layer of skin of your inner forearm. For an interferon gamma release assay, a blood sample is drawn by needle from a vein in your arm.
Test Preparation Needed?