Haematocrit (Hct):
Percent of volume of RBC’s in anti-coagulated whole blood. Determined in laboratory by centrifuging blood sample  heavier erythrocytes sink to bottom of tube  haematocrit calculated from this.
Normally 45% (or 45ml per 100ml blood). Decrease  anaemia; blood loss; excessive IV therapy. Increase  volume depletion, polycythemia vera, extreme physical exercise, dehydration

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