The AFB sputum test is simple, gives quick results, and is low cost. All patients suspected of having pulmonary tuberculosis are tested for this test.

Sputum AFB test is a microscopic test to find tuberculosis bacilli in the patient's sputum. This test is used to diagnose pulmonary tuberculosis, a common infectious disease caused by Mycobacterium tuberculosis bacteria, also known as BK test - the bacteria that causes tuberculosis, used in diagnosing pulmonary tuberculosis.