A Sputum KOH Test (Potassium Hydroxide) is a simple, non-invasive lab test to diagnose fungal respiratory infections by detecting fungal elements like hyphae (filaments) and spores in a cough-up (sputum) sample, helping doctors quickly identify if fungus, rather than bacteria, is causing symptoms like cough, chest pain, or breathing issues, especially for immunocompromised patients. The lab adds KOH to the sputum to dissolve mucus, then uses a microscope, sometimes with Calcofluor White stain, to spot fungal structures, guiding prompt antifungal treatment.
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