Lab method
Oxidase test
Cytochrome c oxidase clue
OK-sih-days
High-yield clue
Pseudomonas and Neisseria are oxidase-positive teaching anchors; many Enterobacterales are oxidase negative.
Overview
A biochemical test concept that helps separate certain Gram-negative organisms by cytochrome c oxidase activity.
Classification
- Biochemical test
- Respiratory enzyme concept
Lab & identification clues
- Color-change vocabulary
- Gram-negative flowchart branch
Associations
- Pseudomonas
- Neisseria
- Enterobacterales contrast
Commonly confused with
- Catalase test
- Coagulase test
Frequently asked questions
What is Oxidase test?
A biochemical test concept that helps separate certain Gram-negative organisms by cytochrome c oxidase activity.
What is the high-yield clue for Oxidase test?
Pseudomonas and Neisseria are oxidase-positive teaching anchors; many Enterobacterales are oxidase negative.
What is Oxidase test associated with?
Oxidase test is associated with Pseudomonas, Neisseria, and Enterobacterales contrast.
What is Oxidase test commonly confused with?
Oxidase test is commonly confused with Catalase test and Coagulase test.
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.