Specifications include, but are not limited to: The FDA-approved Quantiferon TB Gold In-Tube Test is an indirect test for detection of M. tuberculosis infection that has been used by Health and Wellness Programs for over six years. Qiagen is the sole source supplier of this test to commercial customers in the United States (except Puerto Rico and US Virgin Islands). With tuberculosis skin testing, the client is required to have a solution placed under the skin and evaluated 2-3 days later. Additionally, clients are only able to receive skin testing on specific days of the week due to clinics closing on weekends. Quantiferon testing is a blood test that prevents the patient from making more than one trip for TB testing and is also unaffected by prior vaccination to TB. Tests are performed in-house and results are available within days.