AFB (Acid-Fast Bacillus) Stain

The AFB (Acid-Fast Bacillus) Stain is a vital diagnostic tool used primarily to detect Mycobacterium tuberculosis and other closely related bacteria that cause serious infections like leprosy. This test is uniquely helpful because these specific pathogens possess a waxy, lipid-rich cell wall that resists standard staining methods - the AFB technique locks in a dye that stays even after an acid wash, allowing for rapid identification under a microscope. Getting this test done is crucial for early intervention, as it provides a quick preliminary result—often much faster than a traditional culture.