During a helium (He) dilution functional residual capacity (FRC) measurement, the technologist first bleeds in 500 ml of He (He Vol) and obtains an initial reading of 4.0% (FiHe). After equili-bration, the second He reading is 3.2% (FfHe)
What is the patient's FRC?
a. 4450 ml
b. 3125 ml
c. 2680 ml
d. 3670 ml
ANS: B
If the patient is connected to the circuit at the resting level, the FRC can be calculated with the following equation: FRC = (vol He ÷ FiHe) ⋅ [(FiHe – FfHe) ÷ FfHe].
Health Professions
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