Abstract
Blood viscosity, which strongly correlates with the aggregation degree of red blood cells (RBCs), has been identified as an important health index, especially in extracorporeal circulation treatment. The peak frequency of an ultrasonic reflection spectrum was determined to be an effective index by using real blood samples. The relationships among the aggregation sizes observed with an optical microscope, the interface sedimentation velocity, and the peak frequency were investigated after the aggregation degree of the RBCs was controlled.
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