• Tristan Knutson, David Della-Giustina, Eric Tomich, Brandon Wills, Emily Luerssen, and Penny Reynolds.
• Madigan Army Medical Center, Department of Emergency Medicine, Tacoma, Washington.
• West J Emerg Med. 2013 May 1;14(3):283-6.

IntroductionThe Masimo Radical-7 Pulse CO-Oximeter is a medical device recently approved by the US Food and Drug Administration that performs noninvasive oximetry and estimated venous or arterial hemoglobin measurements. A portable, noninvasive device that rapidly measures hemoglobin concentration could be useful in both austere and modern hospital settings. The objective of this study is to determine the degree of variation between the device's estimated hemoglobin measurement and the actual venous hemoglobin concentration in undifferentiated emergency department (ED) patients.MethodsWe conducted a prospective, observational, cross-sectional study of adult patients presenting to the ED. The subjects consisted of a convenience sample of adult ED patients who required a complete blood count as part of their care in the ED. A simultaneous probe hemoglobin was obtained and recorded.ResultsBias between probe and laboratory hemoglobin measurements was -0.5 (95% confidence interval, - 0.8 to -0.1) but this was not statistically significant from 0 (t 0.05,124 = 0.20, P > 0.5). The limits of agreement were -4.7 and 3.8, beyond the clinically relevant standard of equivalency of ± 1 g/dL.ConclusionThese data suggest that noninvasive hemoglobin determination is not sufficiently accurate for emergency department use.

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