The accuracy of the Hewlett-Packard 47201A ear oximeter below 50% saturation.
The Hewlett-Packard 47201A ear oximeter has been shown to measure arterial oxygen saturation (SaO2) above 50% SaO2 with an accuracy of +/- 5%. Below 50% SaO2, the oximeter underestimates arterial saturation in a predictable way, thus allowing a correction factor to be used: true SaO2 = (oximeter reading + 50)/2.
D001784:Blood Gas Analysis; D004431:Ear, External; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000097:blood; D010092:Oximetry / Q000295:instrumentation* / Q000379:methods; D010100:Oxygen / Q000097:blood*
D010100:Oxygen