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LASCA, combined with cross-correlation technique, has been applied for highresolution measurements of the velocity of microflow and its structure in small blood capillaries in vivo. Such measurements have been carried out for the first time behind the resolution limit of the optical system.

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The experimental registration of RBC flow "in vitro" on the base of cross-correlation method is carried out. The range of erythrocytes concentrations in the whole blood solution flow, when the application of physical method used is possible, was revealed.The principle possibility to use the cross-correlation method to register RBC complexes, to estimate their sizes and motion velocity in the flow was shown experimentally. It is easy to see, that the registration of RBC complexes may be treated as the base of cross-correlation method application for the aims of aggregometers, medical diagnostic apparatus development, for example, the device to define the blood group type of probe automatically.