由于月经可在预期时间出现,大多数妇女可能察觉不到受孕14天以内的胚胎丢失。1959年发表了有关早期胚胎丢失的第一篇报道。210名育龄妇女中,107人在排卵24小时内有过性交史,没有可以阻碍受精的上段生殖道异常,因而可能受孕。对此210人作子宫切除,于可能受孕的107份子宫切除标本中,见有从2细胞期到17天的早期胚胎34个,其中10个有明显异常,不能继续存活。由此提出的早期胚胎丢失率为29%。复查40到50年代作子宫切除 Because menstruation can occur in the expected time, most women may not notice the embryo loss within 14 days of conception. In 1959 the first report on the loss of early embryos was published. Of the 210 women of reproductive age, 107 had sexual intercourse within 24 hours of ovulation, had no abnormalities in the upper genital tract that could hinder fertilization and were therefore likely to conceive. Of 210 people underwent hysterectomy, in 107 possible hysterectomy specimens of hysterectomy, seen from 2 cells to 17 days of early embryo 34, of which 10 were significantly abnormal, can not continue to survive. The resulting loss of early embryos was 29%. Review 40 to 50 years for hysterectomy