Abstract: The present invention relates to a method of circulating organo-biological liquids, preferably blood, wherein a liquid contained in a reservoir is released to a pressure (head) level below its original fluid pressure (head) level, thereafter raised periodically or in steps to a pressure (head) level above the original level, then transferred from such level to a reservoir positioned at a predetermined, relatively lower pressure (head) level, and thereupon drained to an outlet positioned approximately at the level of the original pressure (head) level.

Abstract: A test value corresponding to blood subsidence from a syllectogram is determined as a result of the effect of shearing forces on a blood sample, by ascertaining the slope of the test curve representing the syllectogram at a predetermined time beginning with or after the onset of the blood aggregation phase as the test value after:(a) sudden stoppage of the shearing; or(b) a transition to a continuous minor residual shearing.

Abstract: Apparatus for measuring the aggregation rate of particles in liquids, comprising a transparent mixing chamber, a drive causing mixing, a photoelectric system for observing the mixed material in the chamber, and an analysis system following the photoelectric system, where the output signals are fed to a display and/or a warning and/or a memory system. The apparatus is applied to quickly ascertain information disclosing blood subsidence from a minimum amount of blood (capillary native blood free of coagulation inhibitor).