Non-Invasive Hemoglobin Monitoring in Patients With Hemorrhage

The recruitment status of this study is unknown because the information has not been verified recently.
Verified October 2012 by University of Cincinnati.
Recruitment status was  Recruiting
United States Air Force
Information provided by (Responsible Party):
Betty Tsuei, University of Cincinnati Identifier:
First received: October 12, 2012
Last updated: October 16, 2012
Last verified: October 2012
This study will evaluate the accuracy of two rapid methods of measuring hemoglobin in patients with suspected hemorrhage. These methods will be compared with standard laboratory measurements.


Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Non-Invasive Hemoglobin Monitoring in the Patient With Suspected Hemorrhage

Resource links provided by NLM:

Further study details as provided by University of Cincinnati:

Primary Outcome Measures:
  • Accuracy of invasive, point-of-care hemoglobin measurements [ Time Frame: Whenever serial blood draws for standard hemoglobin measurements take place. Typically this is at least once per day. Tracking will continue until ICU Day 7. ] [ Designated as safety issue: No ]
    Whenever blood is drawn for laboratory measurement of serum hemoglobin, we will also use one drop of blood to make a point-of-care measurement using the iSTAT technology.

Estimated Enrollment: 200
Study Start Date: September 2012
Estimated Study Completion Date: December 2013
Estimated Primary Completion Date: September 2013 (Final data collection date for primary outcome measure)
Patients with Suspected Hemorrhage
There is a single group of patients in this study -- those with suspected hemorrhage who satisfy the inclusion and exclusion criteria. The same set of measurements will be take from each patients and those measurements will be compared with one another to determine accuracy.

Detailed Description:

Anemia and bleeding are major causes of morbidity and mortality in both surgical and nonsurgical patients. The current standard of care for monitoring patients at risk for bleeding is serial measurement of hemoglobin levels. At present, the photometric cyanmethemoglobin method is the most widely used technique for monitoring hemoglobin in the lab, and is currently the gold standard. However, this method has potential for delay before final results are obtained.

Immediate hemoglobin measurements are available with portable point-of-care devices such as the iSTAT, which can produce a measurement of hemoglobin concentration in less than 1 minute. Unfortunately, the accuracy of this device has been reported to vary with hemoglobin level, and as such may not be as accurate in detecting blood loss when compared with the gold standard of laboratory analysis.

Recently, a noninvasive, spectrophotometry-based monitoring technology has been developed. This novel technology measures the differential optical density of wavelengths of light passed through the finger in a method similar to conventional pulse oximetry. While some studies have reported that this device appears to be accurate in patients undergoing elective surgical procedures, more recent work suggests that this accuracy degrades with increased blood loss, lower oximeter signal quality and lower absolute Hgb values.

We will evaluate the accuracy of point-of-care and non-invasive SpHb measurements and utility of continuous hemoglobin monitoring in an intensive care unit setting. If these methods of rapid hemoglobin measurement can be validated in patients at risk for ongoing hemorrhage, use of this technology may result in earlier detection of ongoing hemorrhage, expedite appropriate treatment, and improve patient outcomes.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients admitted to the Surgical Intensive Care Unit of University Hospital, Cincinnati will be eligible for this study if they are at risk of ongoing bleeding and require serial CBC measurements. A patient will not be eligible if he or she is:(1) less than 18 years of age, (2) a prisoner, or if (3) clinicians are unable to take pulse oximetry readings due to injuries, burns, amputations, or related problems.

Inclusion Criteria:

  • admitted to surgical intensive care unit (SICU), and
  • at risk of ongoing bleeding, and
  • requires serial CBC measurements

Exclusion Criteria:

  • < 18 years of age, or
  • a prisoner, or
  • unable to have pulse oximetry readings (due to injuries, burns, amputations, or related problems)
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01709786

Contact: Betty J Tsuei, MD 513-558-5661
Contact: Richard D Branson, MSc 513-558-6785

United States, Ohio
University Hospital Recruiting
Cincinnati, Ohio, United States, 45219
Contact: Betty J Tsuei, MD    513-558-5661   
Sponsors and Collaborators
University of Cincinnati
United States Air Force
  More Information


Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Betty Tsuei, Associate Clinical Professor, University of Cincinnati Identifier: NCT01709786     History of Changes
Other Study ID Numbers: Tsuei-2012-06 
Study First Received: October 12, 2012
Last Updated: October 16, 2012
Health Authority: United States: Institutional Review Board

Keywords provided by University of Cincinnati:
Non-invasive monitoring
Medical device accuracy

Additional relevant MeSH terms:
Pathologic Processes processed this record on July 28, 2016