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Fick Cardiac Output Calculator — result sheet
Estimate cardiac output and cardiac index from oxygen consumption and arterial-venous oxygen content difference using the Fick principle.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Fick cardiac output (L/min) = VO₂ ÷ [(CaO₂ − CvO₂) × 10]. Cardiac index (L/min/m²) = cardiac output ÷ body-surface area. The factor 10 converts dL/min to L/min.
The Fick principle relates oxygen consumption to blood flow and the arterial-venous oxygen content difference. This calculator uses supplied oxygen contents and measured or estimated VO₂; it does not estimate oxygen content from saturation or hemoglobin and is not a bedside monitoring substitute.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Oxygen consumption (VO₂) — mL O₂/min; minimum 0.1; maximum 100000
- Arterial oxygen content (CaO₂) — mL O₂/dL blood; minimum 0.1; maximum 100
- Mixed-venous oxygen content (CvO₂) — mL O₂/dL blood; minimum 0; maximum 100
- Body surface area — m²; minimum 0.2; maximum 5
Worked example
| Input | Value |
|---|---|
| Oxygen consumption (VO₂) | 250 |
| Arterial oxygen content (CaO₂) | 20 |
| Mixed-venous oxygen content (CvO₂) | 15 |
| Body surface area | 1.8 |
A 5 mL/dL oxygen difference gives cardiac output 5.00 L/min and cardiac index 2.78 L/min/m².
Assumptions and limits
- VO₂ is entered in mL O₂ per minute.
- Arterial and mixed-venous oxygen contents are entered in mL O₂ per dL of blood.
- Arterial oxygen content must exceed mixed-venous content for a positive extraction difference.
- The factor of 10 converts the resulting dL of blood per minute into L/min.
- Mixed-venous content means an appropriate venous sample for the chosen method, not an arbitrary peripheral venous value.
- Body surface area is supplied separately for cardiac-index normalization.
- The calculator does not derive oxygen content from saturation, hemoglobin, or dissolved oxygen.
- Estimated VO₂ can introduce error; measured oxygen consumption and appropriate sampling improve method validity.
- The result is an educational hemodynamic calculation and does not diagnose shock or determine treatment.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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