[Structural viscosity of the blood].

In 34 healthy normal persons (19 females, 15 males) measurings of the blood viscosity in 7 shearing degrees between 218.7 and 1,312 sec-1 with the rotation viscosimeter Rheotest 2 were carried out. In the medium shearing degrees a large degrease of viscosity with increasing shearing degree was to be established, which corresponds to the structural-viscous behaviour of the blood. In high shearing degrees this decrease of viscosity was only slightly to be proved. As explanation for this we increasingly regard Newton's flowing qualities of the blood in high flowing speed. Statistically ascertained correlations between the height of viscosity and the haematocrit value, the number of erythrocytes and the level of plasma fibrinogen within the normal groups could be performed.