ICU and Critical Care · Pulmonology

Arterial Oxygen Content (CaO₂) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

aoc hemoglobin g dl

g/dL

Allowed range: 3–25 g/dL

aoc sao2 percent

Allowed range: 50–100 %

aoc pao2 mmhg

mmHg

Allowed range: 20–600 mmHg

Result

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Clinical inputs

aoc hemoglobin g dl (g/dL)Accepted range: 3 to 25
aoc sao2 percent (%)Accepted range: 50 to 100
aoc pao2 mmhgAccepted range: 20 to 600

Primary source

Standard arterial oxygen content calculation CaO₂ = (1.34 × Hb × SaO₂/100) + (0.0031 × PaO₂). DOI: 10.1164/ajrccm.158.1.9711041. PMID: 9655694. Scope: adult arterial blood gas and hemoglobin transport calculations; dissolved-oxygen term is not multiplied by hemoglobin. (1998)

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