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目前对宫内节育器(IUD)所发挥的避孕作用,是通过防止受精,或防止孕卵着床,还是引起早期流产,还不清楚。测定带IUD妇女的血清和尿中的绒毛膜促性腺激素的结果也不一致。1977年Mort- on等用玫瑰花抑制试验证实了用人妊娠血清增强抑制母体淋巴细胞血清(ALS)的活性。这种被认为是在母体循环中存在一种免疫抑制早孕因子(EPF),它在受精后几小时内产生。因此,测定RPF可作为受精的一种直接的指征,它将提供
It is unclear whether the contraceptive effects of IUDs are currently prevented by preventing fertilization or by preventing the implantation of an egg or by causing early miscarriage. The results of the determination of human chorionic gonadotropin in women with IUD also did not agree. In 1977, Morton et al. Used rosette inhibition tests to demonstrate enhanced pregnancy inhibitory activity against maternal lymphocyte serum (ALS) using human pregnancy serum. This is thought to be an immunosuppressed early pregnancy factor (EPF) present in the maternal circulation that occurs within a few hours after fertilization. Therefore, determination of RPF can be used as a direct indication of fertilization and it will be provided