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New Study Investigates the Performance of Masimo SpHb® During Acute Bleeding and After Fluid Resuscitation


Masimo (NASDAQ: MASI) announced today the findings of a recently published study in which researchers at Cairo University in Egypt evaluated the accuracy and trending of Masimo noninvasive and continuous hemoglobin (SpHb®), referenced to an invasive laboratory hemoglobin (Lab-Hb) measurement, during acute bleeding and after fluid resuscitation.1

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Masimo Radical-7® with SpHb®, PVi®, and RD rainbow SET™ Sensor (Photo: Business Wire)

Masimo Radical-7® with SpHb®, PVi®, and RD rainbow SET™ Sensor (Photo: Business Wire)

In the study, Dr. Adel and colleagues sought to investigate the performance of SpHb in different volume statuses and perfusion states. They utilized intraoperative data from 70 patients scheduled for major orthopedic procedures with anticipated major blood loss. SpHb, as well as Masimo PVi® and Pi, were measured using a Masimo Radical-7® Pulse CO-Oximeter®. Lab-Hb was measured using a Beckman Coulter LH 750 analyzer. SpHb and Lab-Hb were recorded at three times – a baseline reading five minutes after endotracheal intubation, after major bleeding, and after fluid resuscitation – resulting in 210 time-matched readings, which were divided into fluid responsive and fluid non-responsive samples and low and high perfusion index samples.

Using Bland-Altman analysis, the researchers found “excellent correlation” between Lab-Hb and SpHb (r=0.938). In addition, they reported “excellent accuracy with moderate levels of agreement,” as noted below, for various sample sets:

Sample set                 Mean bias                 Limits of agreement
All                 0.01                 -1.33 to 1.34 g/dL
Fluid non-responsive                 -0.08                 -1.27 to 1.11 g/dL
Fluid responsive                 0.09                 -1.36 to 1.54 g/dL
High Pi                 0.01                 -1.34 to 1.31 g/dL
Low Pi                 0.04                 -1.31 to 1.39 g/dL

The researchers also noted that polar plot analysis (angular bias of -4°) showed “good trending ability for SpHb as a follow-up monitor.”

The investigators concluded that, “SpHb showed excellent correlation with Lab-Hb in fluid responders, fluid non-responders, low-Pi, and high-Pi states. Despite a favorable mean bias of 0.01 g/dL for SpHb, the relatively wide levels of agreement (-1.3 to 1.3 g/dL) might limit its accuracy. SpHb showed good performance as a trend monitor.”

SpHb is not intended to replace laboratory blood testing. 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.

@MasimoInnovates | #Masimo


  1. Adel A, Awada W, Abdelhamid B, Omar H, Dayem O, Hasanin A, and Rady A. Accuracy and trending of noninvasive hemoglobin measurement during different volume and perfusion statuses. J Clin Mon. 2018.

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. 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 and is the primary pulse oximetry at 17 of the top 20 hospitals listed in the 2017-18 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®), Pleth Variability Index (PVi®), and more recently, 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

ORi has not received FDA 510(k) clearance and is not available for sale in the United States.

*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;Jan 8;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 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; risks related to our belief that Masimo noninvasive medical breakthroughs provide cost-effective solutions and unique advantages; 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.

Contact information

Media Contact:
Evan Lamb, 949-396-3376

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