Real-time visibility to changes – or lack of changes – in hemoglobin between invasive blood sampling

The Radical-7® Pulse CO-Oximeter® and rainbow® adhesive sensors are indicated for the noninvasive and continuous monitoring of total hemoglobin concentration (SpHb), along with SpO2, pulse rate, and methemoglobin (SpMet®) – for use with adult, pediatric, and infant patients

Limitations of Traditional Methods

  • > Laboratory hemoglobin values are only available intermittently and are often delayed
  • > Clinicians can estimate blood loss but this can both overstate and understate actual blood loss1,2

SpHb Monitoring: Real-time Visibility to Changes–or Lack of Changes–in Hemoglobin Between Invasive Blood Sampling

SpHb monitoring may provide additional insight between invasive blood sampling when:

  • > The SpHb trend is stable and the clinician may otherwise think hemoglobin is dropping
  • > The SpHb trend is rising and the clinician may otherwise think hemoglobin is not rising fast enough
  • > The SpHb trend is dropping and the clinician may otherwise think hemoglobin is stable

When Considered with All Other Information, SpHb Monitoring Supports Patient-Centered Clinical Management

In this surgical case, SpHb measurements were blinded to the clinicians. Between invasive blood sampling, the clinicians could not assess changes, or lack of changes, in hemoglobin levels.3

In this post-surgical trauma case in which the patient returned to surgery, SpHb measurements were not blinded to the clinicians. Between invasive blood sampling, the clinicians could assess changes, or lack of changes, in hemoglobin levels.4

SpHb Monitoring Across the Continuum of Care

Monitoring hemoglobin continuously from Surgery to the PACU to the ICU and general floor.

Upgradable rainbow SET® Technology Platform

Masimo rainbow SET® is a noninvasive monitoring platform featuring Masimo SET® Measure-through Motion and Low Perfusion pulse oximetry with the option to measure multiple additional blood constituents and physiologic parameters.

  • > Oxygen Saturation (SpO2)
  • > Pulse Rate (PR)
  • > Perfusion Index (PI)
  • > Total Hemoglobin
  • > Oxygen Content (SpOC™)
  • > Pleth Variability Index (PVI®)
  • > Methemoglobin (SpMet®)
  • > Carboxyhemoglobin (SpCO®)
  • > Acoustic Respiration Rate (RRa®)

PDF Resources

Total Hemoglobin


1 Eipe N et al. Indian Journal of Anesthesia. 2006; 50(1): 35-38.
2 Ram GG et al. Chin J Traumatol. 2014;17(4):225-8.
3 Peiris P. et al. Proceeding for the Society for the Advancement of Blood Medicine 2010 Annual Meeting. Abs 4091.
4 McEvoy M. et al. Am J Crit Care. November 2013 vol. 22 no. 6 eS1-eS13. doi:10.4037/ajcc2013729

SpHb monitoring is intended to supplement, not replace, laboratory hemoglobin measurements. Blood samples should be analyzed by laboratory instruments prior to clinical decision making to completely understand the patient’s condition. SpHb accuracy has been validated on healthy adult male and female volunteers and on some surgical patients with light to dark skin pigmentations in the range of 8 g/dL to 17 g/dL. SpHb has not been validated with motion or low perfusion. The SpHb accuracy specification is calculated at one standard deviation, which encompasses approximately 68% of the measurement comparisons to a laboratory reference device. Please contact Masimo for additional testing specifications. Please note: Accuracy specifications were obtained following a specific protocol, in which all Directions for Use were followed and SpHb measurements were compared to validated laboratory reference measurements. Differences in results may be caused by many factors, such as those explained in Masimo’s Directions for Use. Some independent researchers have conducted their own testing and obtained similar results, while other researchers have reported larger differences when comparing SpHb measurements to laboratory measurements.

Caution: Federal law restricts this device to sale by or on the order of a physician.

See Operators Manual for Cautions and Warnings, Indications, Usage instructions, Accuracy Specifications, Contraindications and troubleshooting instructions.