hematocritHematocrit - a device for determining the ratio of the volume of erythrocytes and blood plasma. Is a capillary tube, graded on a scale of 100 points and is used to set stable blood. Squeezed from all capillary blood insert in a centrifuge and centrifuged to a constant value of a column of red blood cells. Normal red blood cells are men 40-48% taken blood volume, women - 36-42%. Using hematocrit you can also determine the amount of a single erythrocyte. The hematocrit decreases with anemia, increased by erythremia, congenital heart defects, burns, shock conditions and so on, See. also the Blood, research methods.