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Updated: Apr 30, 2026

Measuring Deformability and Red Cell Heterogeneity in Blood by Ektacytometry
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Microfluidic analysis of red blood cell deformability.

Quan Guo1, Simon P Duffy2, Kerryn Matthews1

  • 1Department of Mechanical Engineering University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC, Canada V6T 1Z4.

Journal of Biomechanics
|April 29, 2014
PubMed
Summary

Researchers developed a new method to measure red blood cell (RBC) cortical tension, indicating RBC deformability. This sensitive and reproducible technique aids in diagnosing rheological diseases by analyzing RBC microrheology.

Keywords:
Cellular biomechanicsCellular deformabilityMicrofluidicsRed blood cell

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Area of Science:

  • Biophysics
  • Hematology
  • Biomaterials

Background:

  • Red blood cell (RBC) deformability is a critical indicator of rheological health, essential for tissue oxygenation.
  • Decreased RBC deformability signifies cellular stress or pathology, impacting microvascular function.
  • RBC deformability serves as a sensitive biomarker for various rheological diseases.

Purpose of the Study:

  • To present a novel strategy for measuring RBC cortical tension as a direct indicator of RBC deformability.
  • To establish the sensitivity and reproducibility of this method for biological and clinical applications.

Main Methods:

  • Measuring the critical pressure for RBCs to transit through microscale funnel constrictions.
  • Modeling RBCs as Newtonian liquid drops to analyze cortical tension.
  • Assessing the method's ability to discriminate subtle changes in cell fixation and inter-individual variability.

Main Results:

  • The method successfully discriminated between cells fixed with minute variations (0.001%) in glutaraldehyde concentration.
  • RBC cortical tension measurements exhibited high reproducibility when sampled from healthy donors on different days.
  • Inter-individual variability was reproducible, suggesting biological differences rather than methodological inconsistency.

Conclusions:

  • RBC cortical tension measurement is a sensitive and reproducible indicator of RBC deformability.
  • This technique is well-suited for the biological and clinical analysis of RBC microrheology.
  • The method offers a promising tool for diagnosing rheological dysfunction and related diseases.