Critical Care · Cardiology

Oxygen Extraction Ratio (O₂ER) calculator

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

Clinical inputs

o2er hemoglobin g dl (g/dL)

o2er sao2 percent (%)

o2er svo2 percent (%)

Result

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Formula inputs

o2er hemoglobin g dl (g/dL)Accepted range: 3 to 25
o2er sao2 percent (%)Accepted range: 50 to 100
o2er svo2 percent (%)Accepted range: 20 to 90

Primary source

Oxygen extraction ratio O₂ER (%) = (CaO₂ − CvO₂) / CaO₂ × 100 derived from arterial and mixed-venous oxygen contents. DOI: 10.1164/ajrccm.158.1.9711041. PMID: 9655694. Scope: adult perfusion monitoring; typical resting extraction about 22–30%. (1998)

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