Context: The Mantoux tuberculin skin test is often used to screen people at high risk for TB. Those who have been previously immunized may have a false-positive test result. The test may be falsely negative in those with sarcoidosis, Hodgkin's lymphoma, malnutrition, and most notably, active tuberculosis. Interferon gamma release assays (IGRAs), on a blood sample, are recommended in those who are positive to the Mantoux test. These are not affected by immunization or most environmental mycobacteria, so they generate fewer false-positive results. However, they are affected by M. szulgai, M. marinum, and M. kansasii. IGRAs may increase sensitivity when used in addition to the skin test, but may be less sensitive than the skin test when used alone.

Question: What result might someone who has received a TB vaccination get from the Mantoux test?
Answer: false-positive

Question: What does "IGRAs" stand for?
Answer: Interferon gamma release assays

Question: In combination with skin tests, are IGRAs associated with an increase or decrease in sensitivity?
Answer: increase

Question: Which test has fewer false positives: IGRAs or the Mantoux skin test?
Answer: IGRAs

Question: What liquid would you need from a patient to perform IGRAs?
Answer: blood

Question: What is used to test for sarcoidosis?
Answer: Unanswerable

Question: What incorrect result may someone who has not gotten the TB vaccination get?
Answer: Unanswerable

Question: What environmental substance are IGRAs affected by?
Answer: Unanswerable

Question: What has more false-positives than the Mantoux tuberculin test?
Answer: Unanswerable