MedTrace Logo

Calculating Blood Volume by Dilution of Hemoglobin - Pilot Study

NCT01900769 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 20

Last updated 2014-02-19

No results posted yet for this study

Summary

Although blood volume is such an important parameter in everyday clinical medicine it cannot be measured easily. As a matter of fact, it is almost never measured but estimated or calculated based upon numbers derived from mostly healthy patients.

The investigators do not even know whether someone's normal - i.e. before a surgery - blood volume is actually anywhere close to the generally accepted estimate or calculation.

Tests exist in which a substance of known concentration is diluted in a person's blood volume and the resulting concentration is then measured, which allows the blood volume to be calculated. However, none of these tests can be completed at the bedside since they are not fast and require considerable set-up.

This study turns the above approach upside-down: we will dilute the blood slightly with a known small volume of an intravenous fluid commonly used in many clinical settings and measure the concentra-tion of hemoglobin - the oxygen carrier contained in red blood cells - before and after adding the fluid. That allows for similar calculations without using neither specialized substances nor equipment.

Hemoglobin is routinely measured in laboratories and is often a routine test before and during surg-eries and in intensive care units.

Devices that can measure hemoglobin through the skin without actually drawing any blood are avail-able. If found comparable to laboratory determination of hemoglobin they could provide for a bedside and almost real-time assessment of blood volume, something that could be extremely valuable for de-cision making in critical areas of medicine and promoting goal directed therapies.

Conditions

  • Determine Validity of Concept of Using Hemoglobin Dilution to Assess/Measure Blood Volume.

Interventions

DRUG

Blood Volume Dilution

Sponsors & Collaborators

  • Kai Schoenhage

    lead OTHER

Principal Investigators

  • Kai Schoenhage, MD · University of Arizona

Study Design

Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
50 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2013-05-31
Primary Completion
2013-09-30
Completion
2013-09-30

Countries

  • United States

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01900769 on ClinicalTrials.gov