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A sputum stain for Mycobacteria is a laboratory test performed on a sample of your sputum, or phlegm. It’s also known as an acid-fast bacillus (AFB) stain or a tuberculosis (TB) smear. A doctor ...

Indications : The test is usually ordered for those suffering from blocked air passages and persistent productive cough. Sputum is mucus- like substance produced by the lungs. An early morning, deep ...