KOH Prep
- LIS Mnemonic: KOH
Collect
Skin, nails or hair in sterile container
Volume Required
5-6 Flakes, 5-6 Hairs, 1 Nail Clipping
Minimum Required
5-6 Flakes, 5-6 Hairs, 1 Nail Clipping
Transport
Room temperature
Stability
Up to 72 hours after collection
Unacceptable conditions
Specimens submitted on swabs are not acceptable since the cotton strands can resemble hyphae.
Days Performed
Daily
Reported
Same day
CPT
87210
Methodology
Direct Examination
Remarks
This test is only performed on skin, hair and nails. Skin areas should be well disinfected with alcohol. Scraping should be taken from the leading edge of the lesion. Nails should be scraped with a sterile scalpel blade.
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