Lab method
Germ tube test
Sprout with no constriction = C. albicans
High-yield clue
A germ tube without basal constriction is the classic rapid clue for Candida albicans.
Overview
A rapid mycology concept where yeast is incubated in serum and observed for germ tubes, short hyphal projections with no constriction at their base.
Classification
- Rapid presumptive concept
- Serum-induced morphology
- Microscopic readout
Lab & identification clues
- True germ tube = no constriction at base
- Positive is presumptive Candida albicans
- C. dubliniensis can also form germ tubes
- Pseudohyphae show a constriction (negative)
Associations
- Candida albicans identification vocabulary
- Yeast morphology study clue
- Fungal rapid-test framing
Commonly confused with
- Pseudohyphae vs true germ tube
- Candida auris
Your notes
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.