View printer-friendly version << Back

Multicenter Study at UC Davis, UC Los Angeles, and Mayo Clinic Evaluates the Trend Accuracy of Masimo Continuous SpHb®

May 15, 2017

WASHINGTON--(BUSINESS WIRE)--May 15, 2017-- Masimo (NASDAQ: MASI) announced today the findings of an abstract presented at the International Anesthesia Research Society (IARS) Annual Meeting in Washington, DC. In the multicenter study, researchers at three academic medical centers evaluated the trend accuracy of noninvasive, continuous hemoglobin monitoring (SpHb®).1

The prospective observational study was a collaboration among Drs. Richard Applegate and Patricia Applegate of the University of California, Davis; Dr. Maxime Cannesson of the University of California, Los Angeles; and Drs. Prith Peiris, Beth Ladlie, and Klaus Torp of the Mayo Clinic in Jacksonville, Florida.

The researchers enrolled 135 adult patients who were scheduled for surgery with planned arterial catheter placement and continuous SpHb monitoring. Each time a blood sample was obtained, the researchers recorded SpHb using a Masimo Radical-7® Pulse CO-Oximeter® with Masimo rainbow® ReSposable R125 sensors (Revision K; same algorithm as Revision L). They also analyzed each blood sample twice to determine clinical laboratory hemoglobin (tHb; Sysmex 550 or Coulter LH 750), arterial blood gas CO-oximeter hemoglobin (ABGHb; Radiometer ABL800, Nova Biomedical CCX or PhOX, or Siemens RAPIDLab 1265), and point-of-care hemoglobin (aHQHb; HemoCue HB 301).

To assess overall trend accuracy and trend accuracy within defined ranges, the researchers analyzed the correlation of change in tHb to changes in SpHb, ABGHb, and aHQHb. Trend bias within 10% of tHb was considered clinically equivalent. The researchers found that “The confidence intervals for the proportion of samples with trend bias within 10% of tHb overlapped for SpHb (372 of 416 trends; 89.4%; 86.1% to 92.2%), ABGHb (391 of 416 trends; 94.0%; 91.3 to 95.9%) and aHQHb (406 of 416 trends; 97.6%; 95.6 to 98.7%).”

The researchers concluded that “SpHb, ABGHb and aHQHb appear to provide similar intraoperative guidance regarding tHb increase or decrease. Continuous noninvasive SpHb changes larger than ± 0.5 g/dL could provide a reasonable indication for the clinician to obtain a confirmatory blood sample for Hb measurement, but not replace such measurement in guiding transfusion decision making. The transfusion impact of continuous hemoglobin trend monitoring should be studied.”

SpHb monitoring may provide additional insight to the directional trend of hemoglobin between invasive blood samplings – when the SpHb trend is stable and the clinician may otherwise think hemoglobin is decreasing; when the SpHb trend is rising and the clinician may otherwise think hemoglobin is not rising fast enough; or when the SpHb trend is decreasing and the clinician may otherwise think hemoglobin is stable. Clinical decisions regarding red blood cell transfusions should be based on the clinician’s judgment considering, among other factors: patient condition, continuous SpHb monitoring, and laboratory diagnostic tests using blood samples.

The study was supported by research grants from Masimo to Loma Linda University, Mayo Clinic in Florida, and the University of California, Irvine.

@MasimoInnovates | #Masimo


  1. Applegate R, Cannesson M, Applegate P, Peiris P, Ladlie B, and Torp K. Hemoglobin Change Measurement Accuracy Obtained from 3 Devices During Surgery. Proceedings from the 2017 IARS Annual Meeting, Washington, DC. Abstract #A1786.

@MasimoInnovates | #Masimo

About Masimo

Masimo (NASDAQ: MASI) is a global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care by taking noninvasive monitoring to new sites and applications. In 1995, the company debuted Masimo SET® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. Masimo SET® has also been shown to help clinicians reduce severe retinopathy of prematurity in neonates,1 improve CCHD screening in newborns,2 and, when used for continuous monitoring with Masimo Patient SafetyNet™* in post-surgical wards, reduce rapid response activations and costs.3,4,5 Masimo SET® is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world,6 including 17 of the top 20 hospitals listed in the 2016-17 U.S. News and World Report Best Hospitals Honor Roll.7 In 2005, Masimo introduced rainbow® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb®), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and more recently, Pleth Variability Index (PVi®) and Oxygen Reserve Index (ORi™), in addition to SpO2, pulse rate, and perfusion index (PI). In 2014, Masimo introduced Root®, an intuitive patient monitoring and connectivity platform with the Masimo Open Connect™ (MOC-9™) interface, enabling other companies to augment Root with new features and measurement capabilities. Masimo is also taking an active leadership role in mHealth with products such as the Radius-7™ wearable patient monitor, iSpO2® pulse oximeter for smartphones, and the MightySat™ fingertip pulse oximeter. Additional information about Masimo and its products may be found at Published clinical studies on Masimo products can be found at

*The use of the trademark Patient SafetyNet is under license from University HealthSystem Consortium.


  1. Castillo A et al. Prevention of Retinopathy of Prematurity in Preterm Infants through Changes in Clinical Practice and SpO2 Technology. Acta Paediatr. 2011 Feb;100(2):188-92.
  2. de-Wahl Granelli A et al. Impact of pulse oximetry screening on the detection of duct dependent congenital heart disease: a Swedish prospective screening study in 39,821 newborns. BMJ. 2009;338.
  3. Taenzer AH et al. Impact of Pulse Oximetry Surveillance on Rescue Events and Intensive Care Unit Transfers: A Before-And-After Concurrence Study. Anesthesiology. 2010; 112(2):282-287.
  4. Taenzer AH et al. Postoperative Monitoring – The Dartmouth Experience. Anesthesia Patient Safety Foundation Newsletter. Spring-Summer 2012.
  5. McGrath SP et al. Surveillance Monitoring Management for General Care Units: Strategy, Design, and Implementation. The Joint Commission Journal on Quality and Patient Safety. 2016 Jul;42(7):293-302.
  6. Estimate: Masimo data on file.

Forward-Looking Statements

This press release includes forward-looking statements as defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, in connection with the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo Rad-G™.These forward-looking statements include, among others, statements regarding the potential effectiveness of Masimo SpHb®.These forward-looking statements are based on current expectations about future events affecting us and are subject to risks and uncertainties, all of which are difficult to predict and many of which are beyond our control and could cause our actual results to differ materially and adversely from those expressed in our forward-looking statements as a result of various risk factors, including, but not limited to: risks related to our assumptions regarding the repeatability of clinical results; risks related to our belief that Masimo's unique noninvasive measurement technologies, including Masimo SpHb, contribute to positive clinical outcomes and patient safety; as well as other factors discussed in the "Risk Factors" section of our most recent reports filed with the Securities and Exchange Commission ("SEC"), which may be obtained for free at the SEC's website at Although we believe that the expectations reflected in our forward-looking statements are reasonable, we do not know whether our expectations will prove correct. All forward-looking statements included in this press release are expressly qualified in their entirety by the foregoing cautionary statements. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of today's date. We do not undertake any obligation to update, amend or clarify these statements or the "Risk Factors" contained in our most recent reports filed with the SEC, whether as a result of new information, future events or otherwise, except as may be required under the applicable securities laws.

Source: Masimo

Evan Lamb, 949-396-3376

Stay up-to-date with email alerts.

Sign up for email alerts or request information by mail.

Sign up to receive email alerts whenever Masimo Corporation posts new information to the site.

Sign Up for Updates