![]() Only Rheovector provides a Whole Blood Viscosity Test that incorporates both high and low-shear measurements. Other laboratories that provide blood viscosity analysis are capable of performing high-shear viscosity measurements. Blood is subjected to a wide range of shear rates during each cardiac cycle-from peak-systole (high shear) to end-diastole (low shear). When it moves slowly during end-diastole it is thicker and stickier. When blood moves quickly as in peak-systole, it is physically thinner. Endothelial shear stress, which is frictional force applied by pulsatile blood flow against the vessel wall, is defined as blood viscosity multiplied by the shear rate. Shear rate is proportional to blood flow velocity divided by the lumen diameter. Whole blood behaves as a non-Newtonian fluid, and its viscosity changes dramatically as a function of shear rate. ![]() Simple fluids such as water as well as blood plasma and serum are Newtonian fluids, which means their viscosity is constant regardless of shear rate. ![]()
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