Home › Clinical Tools › OSI

🫁 Oxygen Saturation Index (OSI)

UseWhen to use: ventilated patients (esp. pediatric ARDS pathways) with SpO₂ and MAP.

Loading calculator…

StrataHigher OSI ≈ worse oxygenation; published maps link OSI bands to OI thresholds.

LimitsWhen not to use: unreliable SpO₂ / poor waveform. · Pitfall: entering FiO₂ as % without conversion. · Prefer PaO₂ OI when ABG available.

SourceOSI teaching formula / pediatric ARDS literature maps to OI

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.

Methodology · worked example, guidelines & full notes
Clinical takeaway

FiO₂×MAP×100/SpO₂.

When to use

When to use: ventilated patients (esp. pediatric ARDS pathways) with SpO₂ and MAP.

How it works

OSI = (FiO₂ × MAP × 100) / SpO₂.

Key points

  • FiO₂×MAP×100/SpO₂.
  • Parallel to OI.
  • Next: vent / ABG review.

References

  • OSI teaching formula / pediatric ARDS literature maps to OI

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

FiO₂0.40 fraction (0–1) or %
Mean airway pressure (MAP)12 cmH₂O
SpO₂92 %

→OSI5.2

  • FiO₂ used：0.40
  • Cue：<7.5 — lower OSI severity band
Verification & sources · governance
FAQ

Frequently asked questions

Does Oxygen Saturation Index (OSI) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Oxygen Saturation Index (OSI) calculated in practice? Can you show a worked example?
Inputs: FiO₂ 0.40 fraction (0–1) or %, Mean airway pressure (MAP) 12 cmH₂O, SpO₂ 92 % → Result: OSI 5.2（FiO₂ used: 0.40, Cue: <7.5 — lower OSI severity band）
Related tools

Other tools