A nomogram relating pO2, pH, temperature, and hemoglobin saturation in the dog.

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Abstract
The data from 591 dog blood samples on which observations were made of Po2, hemoglobin saturation, PCO2, pH and temperature were analyzed by means of a digital computer. The Hill equation was found to fit the data well in the range from 20-98% saturation. Linear terms for pH and temperature effects were found to improve appreciably the prediction ability of the equation. A similar term for PC02, although statically significant, did not contribute enough additional precision in prediction to justify its inclusion in the final equations. The equations derived are log (S/I - S)= 2.5198 log Po2 + 1.1804 (pH - 7.0) - .047234T - 2.3621 and log Po2 = .37143 log (S/l - S) - .48047 (pH - 7.0) + .019518T + .92247 where S = saturation expressed as a decimal fraction, Po2 is in mm Hg, T is in degrees centigrade. A nomogram relating these variables is also presented.

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