Lab method
Calcofluor white stain
Fluorochrome binding fungal chitin
KAL-koh-flor
High-yield clue
Fungal walls and Pneumocystis cysts glowing bright apple-green/blue-white under UV is the calcofluor white clue.
Overview
A fluorescent brightener concept that binds beta-linked polysaccharides (chitin and cellulose) in fungal cell walls so organisms glow under UV/fluorescence microscopy.
Classification
- Fluorochrome stain concept
- UV/fluorescence microscopy
- Chitin-binding dye
- Rapid screening method
Lab & identification clues
- Bright fluorescence under UV light
- Often combined with KOH
- Highlights hyphae, yeast, and cysts
- Requires a fluorescence microscope
Associations
- Rapid fungal detection vocabulary
- Pneumocystis cyst recognition
- Acanthamoeba and microsporidia study association
Commonly confused with
- Lactophenol cotton blue
- GMS silver stain
Frequently asked questions
What is Calcofluor white stain?
A fluorescent brightener concept that binds beta-linked polysaccharides (chitin and cellulose) in fungal cell walls so organisms glow under UV/fluorescence microscopy.
What is the high-yield clue for Calcofluor white stain?
Fungal walls and Pneumocystis cysts glowing bright apple-green/blue-white under UV is the calcofluor white clue.
What is Calcofluor white stain associated with?
Calcofluor white stain is associated with Rapid fungal detection vocabulary, Pneumocystis cyst recognition, and Acanthamoeba and microsporidia study association.
What is Calcofluor white stain commonly confused with?
Calcofluor white stain is commonly confused with Lactophenol cotton blue and GMS silver stain.
Original concept summary for coursework. Sources checked: OpenStax Microbiology 2e and NCBI Bookshelf Medical Microbiology; reviewed 2026-06. Describes vocabulary and interpretation concepts only; not a lab protocol and not for handling specimens or identifying patient isolates.