KOH Preparation, Range

Abbrev Code:KOH   
Order Code:LAB251Order Name:KOH Prep
Synonyms:Fungal Smear; Potassium Hydroxide Preparation; Fungus
Methodology:Direct examination after 20% KOH hydrolysis of protein debris and cells.
CPT Codes: 87210 x
Test Includes:Direct examination of specimen for fungal elements.
Turnaround Time:Performed 24 hours/day.
Special Instructions:The same specimen may be submitted for bacterial and fungal culture and KOH wet mount.

Collection Instructions

Specimen:Sputum, bronchial aspirate, tissue, pus, granules, genital sources or corneal scraping. Not performed on blood, bone marrow,  CSF or urine; however, these sources are recommended for fungal culture.
Optimal Volume:Visible material
Container:Culturette swab
Alternate Containers: Plastic leakproof container, sterile

Processing and Shipping

Specimen Processing:Store at room temperature.
Shipping Instructions:Ship at room temperature. Must arrive within 24 hours.
Test Performed at or Referral Lab Microbiology  (Range)


Reference Range:No fungal elements seen.
Use:Determine presence of fungi in respiratory or genital sources. If encapsulated yeast are observed, there is a  high correlation with the presence of Cryptococcus neoformans, viable or non-viable forms.

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