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Reference Values for Non-invasive Hydration Status Markers H10-14

This study has been completed.
Information provided by (Responsible Party):
U.S. Army Medical Research and Materiel Command Identifier:
First received: June 30, 2011
Last updated: March 6, 2014
Last verified: March 2014
The objective of this study is to establish reference values for non-invasive hydration status markers. Although there are no hypotheses associated with this study, the outcome will help advance the development of non-invasive hydration status monitors (described above and in H08-12; A-15208) capable of detecting dehydration from a single, static measure. The outcome that this research effort supports what is recognized by the military community as a high priority medical technology gap (MOM ICD v1.3, 2008).

Value Orientation

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Reference Values for Non-invasive Hydration Status Markers

Further study details as provided by U.S. Army Medical Research and Materiel Command:

Enrollment: 62
Study Start Date: June 2011
Study Completion Date: September 2013
Primary Completion Date: March 2013 (Final data collection date for primary outcome measure)
Detailed Description:

Disorders of fluid and electrolyte balance in the U.S. military result in at least 125 hospitalizations, two lost duty days per event, and 9,300 ambulatory hospital visits per year (60% hyponatremia, 40% dehydration) (Carter et al., 2005; DoD, 2008). Diarrhea is a major infectious disease threat which requires aggressive i.v. fluid replacement in 30% of U.S. troops deployed to Iraq or Afghanistan (Brown et al., 2009). It is also important to recognize that the management and outcome of the 662 severe or penetrating traumatic brain injuries (TBI) reported for the military in 2009 (DoD, 2010) may be hindered by dehydration (Clifton et al., 2002). Fluid and electrolyte imbalances also contribute to heat illness (Carter et al., 2005) and can substantially impair combat fighting effectiveness (Dupont, 2003).

The importance of developing a valid assessment measure of human hydration status for clinical and field use is recognized by the military community as a high priority medical technology gap (MOM ICD v1.3, 2008). In far forward locations (levels I-II), orthostatic testing or gross symptoms are most commonly used to estimate hydration status (Manning et al., 2007). However, level I-II methods share symptoms with numerous other maladies and are insensitive until dehydration is severe or becomes debilitating (Levitt et al., 1992; McGee, 1999). Definitive hydration assessment in rear roles of medical care (levels III-V) requires invasive serial blood and/or urine measurements (Feig, 1977; Mange, 1997). Thus, a field-expedient technology that provides an accurate, non-invasive assessment of hydration status would improve medical triage by allowing better fluid-electrolyte management by medics in theatre (point of care), and by medical personnel in the rear levels of care (treatment and return to duty).


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Approximately 150 volunteers (military and civilians) will complete this experiment. A sample size of 120 volunteers is recommended for characterizing a sample reference population and constructing reference intervals (Fraser, 2001). A sample size of 150 will allow for the potential loss of data due to equipment or handling errors, and 'bad' samples resulting from volunteer non-compliance. A subset of as many as 50 volunteers will undergo repeat testing (3 days; ~3 hours) for the purpose of determining within-subject variance.

Inclusion Criteria:

  • male or female subject over the age of 18 years
  • subject in good general health
  • written informed consent for participation in the study
  • report any adverse events?
  • if female of child bearing potential, has the subject confirmed that she is not pregnant
  • if the subject wears contact lenses, is he/she willing to remove them

Exclusion Criteria:

  • Presence of a significant medical condition, which in the opinion of the investigator precludes participation in the study
  • Use of ANY medication other than oral contraceptives
  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: NCT01387529

United States, Massachusetts
US Army Research Institute of Environmental medicine Thermal and Mountain Meidicine Division
Natick, Massachusetts, United States, 01760-5007
Sponsors and Collaborators
U.S. Army Medical Research and Materiel Command
Principal Investigator: Samuel Cheuvront, Ph.D. US Army Insititute of Environmental Medicine Thermal and Mountain Medicine Division
  More Information

Responsible Party: U.S. Army Medical Research and Materiel Command Identifier: NCT01387529     History of Changes
Other Study ID Numbers: S-11-15
Study First Received: June 30, 2011
Last Updated: March 6, 2014

Keywords provided by U.S. Army Medical Research and Materiel Command:
Reference Values processed this record on May 25, 2017