The center of abcesses are generally sterile. Early morning samples are best, and a gram stain should be ordered on the same sample. A significant number of epithelial cells indicate the sample is probably saliva and not sputum. KOH Prep A KOH Prep is used for the diagnosis of fungal ingection. The KOH dissolves all the cells except fungal cells, making them easier to see under the microscope.
Fungal elements appear as branching structures looking like bamboo, sometimes with small buds.
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