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Blood sediment formation at high haematocrit

We present the results of investigation of red blood sediment formation with to use of an optical technique. Blood standing in a container separates with time into clear plasma and red blood cell fraction. The intensity of the light transmitted by the red blood sediment at low and high haematocrit was measured. We show that during the blood sedimentation at high haematocrit first rouleaux form and next the asymptoting of the rouleaux to a packed structure takes place.