AFB (Acid Fast Bacillus), Sputum staining is a test to detect Mycobacteria in a sample of sputum. You may need this test when you have signs and symptoms of a lung infection, such as a chronic cough, weight loss, fever, chills, and weakness, that may be due to TB or a nontuberculous mycobacterial (NTM) infection. This test is also recommended when you have a positive TB screening test and you are in a high-risk group for progressing to active disease. when you have a skin or other body site infection that may be due to mycobacteria; when you are undergoing treatment for TB.
Samples required
Sputum
Preparation for this test
Sample Collection
Who will collect your samples?
Test Information is reviewed by: Dr. Swati Gupta (Anand), MBBS, MD Lab Medicine and written by Dr. Lipika Khurana, BDS, PGDHHM . The test details are for information purpose only. Consult a doctor before taking any test. Last updated on: 15th Apr 2026
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