The following values are reported at maximum effort for a 50-year-old, 70-kg (154-lb) male with significant coronary artery disease during ergometer stress testing. Which of the following is most likely an error?

Results of two blood gas samples drawn from the same patient, 30 minutes apart, are shown below:

Which of the following is the most likely explanation for these differences?

When performing exercise testing on a biologic control, the measurements obtained should be compared with

Which of the following is a valid reason for using biologic controls for DLCo?

Treadmill speed can be verified by