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Related Experiment Videos

An automated tube-type blood viscometer: validation studies.

T Alexy1, R B Wenby, E Pais

  • 1Department of Physiology and Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.

Biorheology
|May 17, 2005
PubMed
Summary

A new automated viscometer, the Rheolog, provides rapid and accurate blood viscosity measurements across a wide shear rate range. This device offers reproducible results, proving valuable for both research and clinical applications.

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Area of Science:

  • Biomedical Engineering
  • Hematology

Background:

  • Previous rheometers presented technical complexity, limiting blood viscosity data availability.
  • Automated viscometers are needed for efficient and accessible blood viscosity analysis.

Purpose of the Study:

  • To validate the accuracy and reproducibility of the automated tube-type viscometer, Rheolog.
  • To assess the impact of storage conditions on blood viscosity measurements using the Rheolog.

Main Methods:

  • Validation of the Rheolog using normal human blood against cone-plate and Couette viscometers.
  • Evaluation of blood viscosity data at varying hematocrit levels and shear rates (1-1500 s(-1)).
  • Assessment of storage time and temperature effects on blood viscosity measurements.

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Main Results:

  • Rheolog measurements showed high reproducibility (CV < 5%) and were independent of hematocrit and shear rate.
  • Rheolog blood viscosity data closely correlated with established viscometer methods across different hematocrit levels.
  • Minimal impact of storage at room temperature (up to 8 hours) and 4°C (up to 4 days); significant changes observed after 3 hours at 37°C.

Conclusions:

  • The Rheolog offers a rapid, accurate, and reproducible method for determining blood viscosity.
  • This automated viscometer is suitable for both basic scientific research and clinical studies.
  • Optimal storage conditions are crucial for maintaining the integrity of blood viscosity measurements.