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Clinical & CardioGenerated accuracy model review: 2026-05-06
Oxygen Index (OI) accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- OI = (FiO2% * MAP) / PaO2
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Mean Airway Pressure: 10 cmH2O
- FiO2: 50%
- PaO2: 80 mmHg
Expected outputs
- Oxygen Index: 6.3
- Severity: Mild/Normal
Known limitations
- Clinical parameters such as MAP and PaO2 change rapidly. This calculation is a snapshot in time.
Assumptions
- The calculation assumes the ventilator settings and arterial blood gas are from the same clinical moment.
- OI is a severity descriptor, not a standalone rule for intubation, ECMO, or other treatment decisions.
- Thresholds vary by population and protocol, especially between neonatal, pediatric, and adult care settings.
Unit handling
- Mean Airway Pressure accepts values in cmH2O.
- FiO2 accepts values in %.
- PaO2 accepts values in mmHg.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current oxygen-index-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Oxygen Index (OI).
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.