• Marlin Wayne Causey, Seth Miller, Andrew Foster, Alec Beekley, David Zenger, and Matthew Martin.
• Department of Surgery, Madigan Army Medical Center, Tacoma, WA 98431, USA. mwcausey@msn.com
• Am. J. Surg. 2011 May 1;201(5):592-8.

BackgroundHemoglobin levels must be obtained through blood draws, which are invasive, time-consuming, and provide only 1 data point at a time rather than continuous measurements. The Masimo Radical-7 SpHb Station (Masimo Corporation, Irvine, CA) has been shown by its manufacturers to provide accurate noninvasive hemoglobin measurements in physiologically normal patients. The objective of this study was to validate noninvasive hemoglobin measurements using the Masimo Radical-7 device.MethodsData were prospectively collected in 2 cohorts of patients: major operations requiring hemodynamic monitoring (operating room [OR]) and critically ill patients (intensive care unit [ICU]). Noninvasive hemoglobin measurements (SpHb) were recorded and were then compared with laboratory hemoglobin measurements.ResultsData were collected on 60 patients (OR = 25 and ICU = 45). The overall correlation of the Masimo SpHb and the laboratory Hb was .77 (P < .001) in the OR group with a mean difference of .29 g/dL (95% confidence interval [CI], .08-.49). The overall correlation in the ICU group was .67 (P < .001) with a mean difference of .05 g/dL (95% CI, -.22 to -.31).ConclusionsNoninvasive hemoglobin monitoring is a new technology that correlated with laboratory values and supports the continued study of noninvasive hemoglobin monitoring.Copyright © 2011 Elsevier Inc. All rights reserved.

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