Fick Oxygen Supply Calculator

The Fick Oxygen Supply Calculator estimates Oxygen Delivery (DOâ‚‚), Oxygen Consumption (VOâ‚‚), and Oxygen Extraction Ratio (Oâ‚‚ER) based on cardiac output, hemoglobin, and saturation levels. This tool helps healthcare providers and students quickly assess cardiovascular efficiency and tissue oxygenation. Whether you are managing critical care patients, diagnosing respiratory issues, or monitoring metabolic demand, this calculator delivers estimated results. It streamlines complex physiological assessments into actionable data.

Quick Examples

L/min (2-30)
Please enter a value between 2 and 30 L/min
g/dL (5-20)
Please enter a value between 5 and 20 g/dL
70-100%
20-90%
mmHg (50-150)
Please enter a value between 50 and 150 mmHg

How Oxygen Transport Metrics Are Calculated

Oxygen Transport Metrics measure how effectively your cardiovascular system delivers and uses oxygen. This calculation relies on the Fick Principle, a standard method in physiology.

VO₂ = CO × (CaO₂ - CvO₂)

Where:

  • VOâ‚‚ = Oxygen Consumption
  • CO = Cardiac Output
  • CaOâ‚‚ = Arterial Oxygen Content
  • CvOâ‚‚ = Venous Oxygen Content

First, the tool determines arterial and venous oxygen content using hemoglobin levels and saturation values. Then, it calculates Oxygen Delivery by multiplying cardiac output by arterial content. Finally, it finds Oxygen Consumption by measuring the difference between arterial and venous blood oxygen. The Oxygen Extraction Ratio is then derived to show efficiency. This method provides a reference snapshot of cardiopulmonary function.

What Your Oxygen Transport Metrics Mean

Your Calculation reveal the balance between oxygen supply and demand in your body.

Normal Resting State: An Oxygen Delivery of 500-1000 mL/min and an Extraction Ratio of 20-30% generally indicates healthy cardiovascular function at rest.

Elevated Metabolic Demand: If your Oxygen Consumption rises above 300 mL/min or your Extraction Ratio exceeds 30%, your body is likely under stress. This is common during moderate exercise but may signal compensation for illness if you are at rest.

Low Oxygen Delivery: A result below 500 mL/min suggests potential issues like anemia or reduced heart function, warranting further clinical review.

Important

Remember that individual baselines vary, so compare Your Calculation to your personal history over time.

Related Calculators

Calculation logic verified using publicly available standards.

View our Accuracy & Reliability Framework →