THE OXYGEN AND CARBON DIOXIDE CONTENT OF THE ARTERIAL AND VENOUS BLOOD OF NORMAL SUBJECTS

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Abstract
The CO2 and O2 contents were detd. in the arterial blood of 29 and in the venous blood of 67 normal men. The mean value for the venous O2 was 10.6 [plus or minus]0.36 vol.% and 85% of the readings fell between 7 and 14 vol.%. The mean value for carbon dioxide was 57.8 [plus or minus] 0.35 vol.%. These values were significantly different from the mean of the mean values recorded in the literature, namely, 13.6 vol.% for O2 and 53.55 vol.% for CO2. The values for the arterial blood gases[long dash]19.0 [plus or minus] 0.47 for O2 and 49.9 [plus or minus] 0.51 for CO2[long dash] did not differ significantly from the mean of the mean values reported previously. There was a marked variability in the level of the blood gases in the same individual as measured by the self-correction in terms of intra-class correlation coefficients; these values were quite low, ranging from 0.38 for venous O2 to 0.01 for arterial CO2. No significant correlation was found between the levels of arterial and venous O2 or CO2. A fair degree of correlation was given between arterial O2 and CO2, with a coefficient of [long dash]0.54; and a slightly higher correlation occurred between these gases on (he venous side, with a coefficient of [long dash]0.76.

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