Steady state carbon monoxide diffusing capacity in normal females

The diffusing capacity of the lung for carbon monoxide was determined in 100 normal females age 20—60 years during steady state treadmill exercise. Values obtained were compared with a corresponding study in males, and it was established that when body surface area is taken into account there is no significant sex difference in Dl CO . No significant decrease in diffusing capacity was seen with advancing age. Normal mean values and limits of normal for the various age groups are given. Submitted on February 8, 1961