Abstract
In order to determine the analytical precision and physiological fluctuation of a battery of blood tests (hematocrit, blood viscosity, plasma viscosity, blood filterability, red cell aggregation and blood cell counts) 15 volunteers were tested at fortnightly intervals for 16 weeks in the absence of overt disease. The results indicate that accuracy of rheological tests is satisfactory (analytical variation 0.6–9.3%). The physiological variation not only depends on the variable tested, but apparently also on the individual. Plasma and blood viscosity are promising tests as they can be measured accurately and show little physiological variation.
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