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孕妇的生理变化,有许多在非孕状态被视为异常现象,妊娠期生理性血液稀释就是其中之一,常误认为贫血而进行治疗。孕妇血液稀释是由于血浆量增加,超过了红细胞的增加。正常妊娠从6周开始,血浆量逐渐增加,至妊娠24～34周达高峰,一直持续到妊娠末期,约比非孕期增加42%。 Sibai等为探讨血浆量增加的临床意义,研究了高血压孕妇血浆量的增加与胎儿预后的关系。发现妊娠20～25周母血浆量的增加,在宫内死胎组比胎儿发育正常组有明显障碍,而且在妊娠26～29周其血浆量反而比前期减少。无合并症的正常孕妇在发生胎儿宫内发育迟缓
Physiological changes in pregnant women, many in non-pregnant state is considered an anomaly, physiologic hemodilution during pregnancy is one of them, often mistaken for anemia and treatment. Hemodilution in pregnant women is due to an increase in plasma volume that exceeds the increase in erythrocytes. Normal pregnancy from the beginning of 6 weeks, the plasma volume gradually increased to reach the peak of 24 to 34 weeks of pregnancy, until the end of pregnancy, about 42% increase over non-pregnancy. Sibai, etc. To explore the clinical significance of increased plasma levels, study of hypertensive maternal plasma levels and fetal prognosis. Found that 20 to 25 weeks of pregnancy increase in the amount of maternal plasma in the stillbirth group of fetal than the normal fetal development group have obvious obstacles, and in the 26 to 29 weeks of pregnancy, the plasma volume but less than the previous period. No complications of normal pregnant women in the development of intrauterine growth retardation