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TB Screening Tests

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Also known as: Purified Protein Derivative; PPD; Mantoux; Latent Tuberculosis Infection Test; Interferon-gamma Release Assays; IGRA; T-Spot®.TB; QuantiFERON®-TB Gold (QFT-G); QuantiFERON®-TB Gold In-Tube (QFT-GIT)
Formal name: Tuberculin Skin Test; Interferon Gamma Release Assays

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

Sample Required?

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?

None