The following data are obtained during a closed-circuit FRC determination: Which of the following is the FRC?
A) 1.32 L BTPS
B) 1.50 L BTPS
C) 1.55 L ATPS
D) 2.17 L ATPS

Question

The following data are obtained during a closed-circuit FRC determination:  Which of the following is the FRC?
A) 1.32 L BTPS 
B) 1.50 L BTPS 
C) 1.55 L ATPS 
D) 2.17 L ATPS

Quizplus · Accepted Answer

The FRC is the volume of gas remaining in the lungs at the end of a normal expiration. It is measured at BTPS (body temperature and pressure, saturated with water vapor). The correct FRC value is 1.50 L BTPS. The other options are incorrect because they either represent the FRC at ATPS (ambient temperature and pressure, dry) or an incorrect value.

The Following Data Are Obtained During a Closed-Circuit FRC Determination