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Why would a separate test be ordered for fungus or an AFB smear and culture?

April 26, 2017AFB culture Fungus ordered separate smear Test

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Why would a separate test be ordered for fungus or an AFB smear and culture?

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These tests detect organisms that do not grow on nutrient media typically used for a routine sputum culture. Fungus or mycobacterium species may take several weeks to grow in the laboratory, and they require the use of special stains to be detected under the microscope.