Journal of Applied Physiology
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J Appl Physiol 18: 739-741, 1963;
8750-7587/63 $5.00
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Optical density changes in dog blood at full oxygen saturation with changes in pCO2

Peter Salmon 1, Richard Stish 1, and Maurice B. Visscher 1

1 Department of Physiology, University of Minnesota Medical School, Minneapolis, Minnesota

Quantitative studies have been made of the changes in optical density of whole blood at two wavelengths at full oxygen saturation with changes in carbon dioxide tension and content. At both lgr 630 mµ and lgr 805 mµ there are lower densities with increasing pCO2 at full oxygen saturation. From pCO2 1.5 to 243 mm Hg the decrease is 0.133 OD units and is equal at the two wavelengths. The OD is linearly related to the pH change. The effect is ascribed to the differences in light scattering by erythrocytes with changing shape and/or volume of the cells. This effect results in a systematic error in measurements of oxygen content of blood when the carbon dioxide content varies, as it does between arterial and venous blood.

Submitted on October 22, 1962






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