了解新生儿免疫水平对指导临床有重要意义。作者分析了新生儿出生时体内补体C_3、C_4及备解素因子B含量与分娩方式对其含量的影响。结果发现:正常阴道分娩新生儿脐血中C_3、C_4及备解素因子B的平均含量分别为88.9mg％、39.9mg％及26.2mg％,与母体内相应含量相比,差异有非常显著意义,分别为母体的61.9％、65.5％及61.3％。 Understanding the level of newborn immunity is of great importance to clinical practice. The authors analyzed the effect of intrapartum complement C_3, C_4 and properdin B content and mode of delivery on the content of newborns at birth. The results showed that the average contents of C_3, C_4 and properdin B in neonates with normal vaginal delivery were 88.9mg%, 39.9mg% and 26.2mg%, respectively, which were significantly different from the corresponding contents in the mother , 61.9%, 65.5% and 61.3% of the maternal body respectively.