RESULTS: There is no evident change in control group; But the haenoglobin( Hb) and Hematocrit( HCT) in pregnant woman descend gradually with the increase of pregnant time, especially in midpregnancy and postpregnancy.

• 结果:对照组每次测定血红蛋白和红细胞压积无明显变化;孕妇组随着孕期增加,测得体内血红蛋白和红细胞压积逐渐下降,尤其是妊娠中、期下降更为明显。