Laboratory tests of the oximeter with automatic compensation for vasomotor changes

Abstract

Abstract The Millikan type oximeter with automatic compensation for ear thickness has been tested by chemical analysis of arterial blood drawn from subjects breathing a mixture of 8 per cent oxygen and 92 per cent nitrogen. Agreement within ±5 per cent was obtained for values of oxygen saturation as low as 60 per cent. Two instruments were tested and found to give similar values. One instrument used a d'Arsonval galvanometer and the other a recording milliameter with a direct current amplifier.