A subject has her DLCOsb measured as 10.1 ml CO/min/mm Hg (STPD);her diffusing capacity measured by the DLCOrb is 9.1 ml CO/min/mm Hg (STPD).These findings are consistent with:
A) Normal lung function
B) Normal difference in a subject with restriction
C) An improperly calibrated He analyzer
D) The inability to breath hold near TLC

Question

Quizplus · Accepted Answer

The difference between DLCOsb (single-breath diffusing capacity for carbon monoxide) and DLCOrb (rebreathing diffusing capacity for carbon monoxide) values is normal in the context of restrictive lung disease. This is because both values are expected to be reduced proportionally in restrictive conditions, maintaining a normal difference between them.

A Subject Has Her DLCOsb Measured as 10