Measurement of human blood viscosity by an electromagnetic spinning sphere viscometer

Abstract

We herein applied an electromagnetic spinning sphere (EMS) viscometer to the measurement of human blood viscosity for the first time. We collected blood samples from 100 healthy outpatient volunteers in order to analyse viscosity dependence on blood cell parameters and on the shear rate with a simple approximation formula [η_i (γ)\, = A_i γ^{- pi} + η₀]. Viscosity dependence on blood cell parameters was relatively high at a high shear rate, but became lower as the shear rate decreased. The approximation formula with appropriate parameters of A_i and p_i nearly faithfully reproduced actual blood rheological behaviour with a standard deviation of 1.5%. The distributions of A_i and p_i values were broad, suggesting that the pattern of viscosity dependence on the shear rate varied with individual differences. The results obtained using the EMS viscometer suggest that blood viscosity values are individual-specific and actual individual measurements are important for understanding rheological conditions.

Keywords:

• Blood viscosity
• blood cells
• shear rate
• rheology

Disclosure statement

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.