Fick Cardiac Output Calculator

This calculator applies the Fick principle, cardiac output equals oxygen consumption divided by the arteriovenous oxygen difference times ten. Enter VO2 together with haemoglobin, the arterial saturation, the mixed venous saturation, height and weight, and it returns cardiac output, cardiac index, both oxygen contents, the a-v difference, the extraction ratio and stroke volume. A second tab estimates VO2 instead, either from an assumed 125 or 110 mL per minute per square metre or from the LaFarge equation. That estimate is the weak link: assumed VO2 can be far from the measured value in an individual patient, so only a measured VO2 gives a true Fick.