Final answer:
The Quantiferon-TB (QFT) blood test is a diagnostic tool used to detect tuberculosis (TB) infection. It measures the body's immune response to the TB bacteria by looking for the release of interferon-gamma. A positive test result indicates TB infection.
Step-by-step explanation:
The Quantiferon-TB (QFT) blood test is a diagnostic tool used to detect tuberculosis (TB) infection. It is a blood test that measures the body's immune response to the bacteria that cause TB. The test looks for the release of a specific substance called interferon-gamma when the person's blood is exposed to TB antigens. A positive QFT test result indicates that the person has been infected with TB bacteria.