What does the KOH prep test involve collecting?

The KOH prep test involves collecting cells from the infected site. This procedure is primarily used to diagnose fungal infections, particularly dermatophyte infections or yeast infections. The sample can be taken from skin lesions, nails, or mucosal surfaces where the suspected infection is present.

Once the sample is obtained, it is treated with potassium hydroxide (KOH) solution. KOH acts to clear non-fungal material and makes fungal elements, such as hyphae and spores, more visible under a microscope. By observing these structures, the laboratory professional can identify the presence of a fungal infection, which is crucial for appropriate treatment.

The other options, such as whole blood, urine, or fecal matter, are not typically used for this particular test and do not provide the necessary material needed for detecting fungal elements.