Which TB test requires only a single visit for results?

Which TB test requires only a single visit for results?

• A. Mantoux tuberculin skin test
• B. Sputum culture
• C. Chest X-ray
• D. Quantiferon-TB (QFT) blood test

Answer: (D)

One-visit TB testing is achieved with the Quantiferon-TB blood test. This test uses a blood sample collected during a single clinic visit, and the lab processes it to give results without requiring the patient to return for a reading. In contrast, the Mantoux tuberculin skin test requires a second visit 48 to 72 hours later to measure the induration and determine if the result is positive. A sputum culture involves collecting a sample and waiting days to weeks for bacteria to grow in the lab, so it cannot provide immediate results. A chest X-ray can be done in one visit, but it’s imaging that suggests possible TB and is not a definitive test for TB infection on its own; it doesn’t provide a read that confirms infection in a single step. Therefore, the test that provides results from one visit is the Quantiferon-TB blood test.

One-visit TB testing is achieved with the Quantiferon-TB blood test. This test uses a blood sample collected during a single clinic visit, and the lab processes it to give results without requiring the patient to return for a reading. In contrast, the Mantoux tuberculin skin test requires a second visit 48 to 72 hours later to measure the induration and determine if the result is positive. A sputum culture involves collecting a sample and waiting days to weeks for bacteria to grow in the lab, so it cannot provide immediate results. A chest X-ray can be done in one visit, but it’s imaging that suggests possible TB and is not a definitive test for TB infection on its own; it doesn’t provide a read that confirms infection in a single step. Therefore, the test that provides results from one visit is the Quantiferon-TB blood test.