Many studies have determined the incidence of spontaneous abortion in women, and it has been suggested that the rate after assisted conception is higher than that during natural pregnancy. Problems in interpreting results can, however, arise from the use of different reference points to estimate gestational age and from the availability of alternative and complementary methods for diagnosing an early pregnancy. We therefore determined the rate of spontaneous abortion among 430 women undergoing assisted conception and compared it with data from other series.
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