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🫁 Expected PaO₂ (Age, Room Air)

UseWhen to use: room-air ABG review in adults near sea level.

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StrataMeasured PaO₂ well below expected prompts A–a gradient and cause evaluation.

LimitsWhen not to use: supplemental O₂ without adjusting expectation. · Pitfall: ignoring altitude/supine effects. · Not a stand-alone diagnosis.

SourceAge-expected room-air PaO₂ teaching estimate

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

104.2−0.27×age.

When to use

When to use: room-air ABG review in adults near sea level.

How it works

Expected PaO₂ ≈ 104.2 − 0.27×age.

Key points

  • 104.2−0.27×age.
  • Room-air age decline.
  • Next: A–a / P/F.

References

  • Age-expected room-air PaO₂ teaching estimate

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.

Age65 years
Measured PaO₂ (optional)72 mmHg
Altitude noteSea-level / near sea-level

→Expected PaO₂87mmHg

  • Formula：104.2 − 0.27×age
  • Setting：Sea-level room-air upright teaching estimate
  • Measured − expected：-15 mmHg
Verification & sources · governance
FAQ

Frequently asked questions

Does Expected PaO₂ (Age, Room Air) 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 Expected PaO₂ (Age, Room Air) calculated in practice? Can you show a worked example?
Inputs: Age 65 years, Measured PaO₂ (optional) 72 mmHg, Altitude note Sea-level / near sea-level → Result: Expected PaO₂ 87 mmHg（Formula: 104.2 − 0.27×age, Setting: Sea-level room-air upright teaching estimate, Measured − expected: -15 mmHg）
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