Advanced
Technical
IVT
oxygenation index
A calculated parameter incorporating mean airway pressure to assess severity of lung injury.
Full Definition
The oxygenation index is calculated as (FiO2 × mean airway pressure × 100) / PaO2 and provides a more comprehensive assessment of lung injury severity than P/F ratio alone. In pediatric critical care, the oxygenation index is used in ARDS classification, ECMO candidacy decisions, and prognostic scoring. Values greater than 25 indicate severe lung injury, while values greater than 40 may prompt consideration for extracorporeal support in appropriate candidates.
Usage
Usage note: Use as two words; commonly abbreviated as OI in clinical notes.
In Context
- "The oxygenation index increased to 35, meeting criteria for severe pediatric ARDS." — Assessment note
- "ECMO consultation was obtained given the persistently elevated oxygenation index above 40." — Consultation request
Also known as
OI
Don't confuse with
P/F ratio
A-a gradient
OSI