Editing Fick principle (section)

==Assumed Fick determination==
In reality, this method is rarely used due to the difficulty of collecting and analysing the gas concentrations.  However, by using an assumed value for oxygen consumption, cardiac output can be closely approximated without the cumbersome and time-consuming oxygen consumption measurement.  This is sometimes called an assumed Fick determination.{{cn|date=March 2021}}

A commonly used value for O<sub>2</sub> consumption at rest is {{val|125|ul=mL}} O<sub>2</sub> per minute per square meter of [[body surface area]].{{cn|date=February 2022}}