Calculates systemic oxygen consumption from cardiac output and arteriovenous oxygen content difference.
Overview
Calculates systemic oxygen consumption from cardiac output and arteriovenous oxygen content difference.
Clinical Significance
Applies the reverse Fick principle to estimate whole-body oxygen consumption from haemodynamic and blood-gas measurements.
When to Use
- Use when the required measurements are available, reliable and clinically relevant.
How It Is Calculated
- VO₂ = cardiac output × (CaO₂ − CvO₂) × 10.
Interpretation
- Applies the reverse Fick principle to estimate whole-body oxygen consumption from haemodynamic and blood-gas measurements.
Worked Example
Enter valid values in the displayed units. MedicalC then applies: VO₂ = cardiac output × (CaO₂ − CvO₂) × 10.
Limitations
- The result does not establish a diagnosis or mandate treatment.
- Measurement error may be more important than arithmetic precision.
- Published thresholds may differ between populations and settings.
Clinical Pearls
- Document the source values and units with the final result.
- Review trends rather than isolated values where appropriate.
Common Mistakes
- Using the wrong unit.
- Combining values from different time points.
- Applying the result outside the intended measurement or clinical context.
Frequently Asked Questions
What does this calculator provide?
Calculates systemic oxygen consumption from cardiac output and arteriovenous oxygen content difference.
What formula is used?
VO₂ = cardiac output × (CaO₂ − CvO₂) × 10.
Can the result be used alone?
No. It must be interpreted with the full clinical assessment and appropriate investigations.
What is the main limitation?
The result depends on accurate source measurements, correct units and appropriate clinical applicability.
References
- Standard Fick principle physiology. — Primary, supporting or authoritative reference for the implemented relationship.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026