The circulating red cell volume and body hematocrit in normal pregnancy and the puerperium by direct measurement using radioactive red cells.

摘要: Dieckmann and Wegner,l Thomson, 2 McLennan Thouin Caton, Roby associates,4 have all measured reported plasma, whole blood, red cell volumes during pregnancy. The studies reviewed agree that there is a progressive increase in plasma volume into the third trimester. Indirectly calculated revealed same increase. There are differences of opinion, however, as to whether statistically significant reduction total blood prior delivery. length time for return normal also varies different reports. No doubt part disagreement has been result too few determinations on individual. lack number postpartum observations, especially late compared prepartum period, adds difficulty interpreting gestational data. Perhaps if more investigators had used observations norm rather than nonpregnant group, data might better evaluated. Rather wide variations results were reported. These inconsistencies due technical limitations dye technique. Also, small series extreme individual variations, when control groups, sufficient degree affect an arithmetic mean. subject known inherent errors, this error may be considerable. use groups controls comparison limits evaluation quantitative terms.