Oxygen Extraction Ratio Calculator

Calculates O₂ER from arterial and mixed venous oxygen contents.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
O₂ER
—
%
CaO₂−CvO₂
—
vol%
Reference status
—
20–28%
Normal/reference: 20–28%.

Clinical Significance

O₂ER from arterial and mixed venous oxygen contents.

This calculator expands that idea by identifying the relevant measured values, substituting the selected inputs, and carrying the arithmetic through in the solving steps.

Provides an index of oxygen extraction/utilization relative to arterial oxygen content.

Calculator output should be interpreted with the patient’s condition, measurement quality, and local clinical policy.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.