title: Validation of noninvasive hemoglobin measurements using the Masimo Radical-7 SpHb Station.
abstract: BACKGROUND
  Hemoglobin 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.
  
  
  METHODS
  Data 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.
  
  
  RESULTS
  Data 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).
  
  
  CONCLUSIONS
  Noninvasive hemoglobin monitoring is a new technology that correlated with laboratory values and supports the continued study of noninvasive hemoglobin monitoring.
authors.affiliation: Department of Surgery, Madigan Army Medical Center, Tacoma, WA 98431, USA. mwcausey@msn.com
authors.forename: Marlin Wayne
authors.initials: MW
authors.lastname: Causey
authors.forename: Seth
authors.initials: S
authors.lastname: Miller
authors.forename: Andrew
authors.initials: A
authors.lastname: Foster
authors.forename: Alec
authors.initials: A
authors.lastname: Beekley
authors.forename: David
authors.initials: D
authors.lastname: Zenger
authors.forename: Matthew
authors.initials: M
authors.lastname: Martin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004867:Equipment Design; D005260:Female; D005500:Follow-Up Studies; D006454:Hemoglobins / Q000032:analysis*; D006470:Hemorrhage / Q000097:blood* / Q000175:diagnosis; D006801:Humans; D007362:Intensive Care Units; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D010092:Oximetry / Q000295:instrumentation*; D011446:Prospective Studies; D015203:Reproducibility of Results; D055815:Young Adult
chemical_list: D006454:Hemoglobins