Clinical studies of the blood volume. II. The relation of plasma and total blood volume to venous pressure, blood velocity rate, physical measurements, age, and sex in ninety normal humans

Medical literature contains several works on the blood volume in normal persons, based on findings with the dye method of Keith, Rown-tree and Geraghty (1) or modifications thereof, (2, 3, 4). Our justification for presenting an additional study is that the principal errors in-herent in the earlier techniques are minimized by the dye method we have employed. By this method, described in detail in a previous com-munication (5), the absolute plasma volume can be measured with considerable accuracy, and the calculation of total blood volume is based on the plasma volume and the hematocrit values of ve-nous blood samples. It also seemed worth while to consider the normal blood volume in relatio