Abstract
A spectro-photometric procedure for determining blood oxygen saturation is described. Comparison of the results with those obtained by Van Slyke analysis, gave a regression line y = 1.204 x - 1.76, y being the spectro-photometric results, x the Van Slyke results. The standard deviation of the difference between double analyses was 0.53%, is considered satisfactory for the clinical application of the method.

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