Abstract
BACKGROUND:
Research on hemorheology is driven in part by its significance in blood diseases and the possible use of hemorheology as a diagnostic tool. However, existing data on blood rheology are limited largely to measurements of steady shear behavior often with varying measurement protocols and insufficient characterization of the physiology.
OBJECTIVE:
The effects of ex vivo aging and environmental conditions on blood viscosity are investigated to improve standards for hemorheology measurements.
METHODS:
Measurements on the viscosity of blood from nine healthy donors are obtained and the physiological state of the blood determined. Steady and transient shear measurements are reported as a function of time from withdrawal. The effect of transportation temperature is also assessed.
RESULTS:
Blood transported at 4 °C may exhibit anomalous viscosity variations for short to intermediate times, as opposed to blood transported at room temperature. A time of approximately 3.0 hours was identified as the maximum time after the initial test that accurate rheological tests can be conducted on blood samples.
CONCLUSIONS:
Measurement protocol and time limit guidelines are established for conducting accurate rheological measurements on blood.
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