Higher viscosity of blood will increase the amount of stress placed on the heart while it is pumping. Viscosity of blood is highest when hematocrit is highest.
A hematocrit test is a simple blood test that measures the percentage of red blood cells in your blood. Red blood cells are important because they carry oxygen throughout your body. Low or high hematocrit levels may be signs of blood disorders or other medical conditions.
Increased viscosity increases the resistance to blood flow and thereby increases the activity of the heart . Some patients with anemia have low hematocrits, and therefore reduced blood viscosities. Hematocrit values, plasma fibrinogen levels, and erythrocyte deformability are well-recognized factors affecting blood viscosity.
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