How to avoid multiple pregnancies in assistive reproductive technologies.

摘要: Since 1980, there has been a worldwide dramatic increase in multiple births. This seems to be due an the age of reproduction, use ovulation induction, and vitro fertilization. Scarce data suggest that each these causes is responsible for about one-third problem, although quintuplets more are almost invariably induction. There little or no effort issue guidelines regulations with respect but much advice as how control problem fertilization by limiting number embryos transferred. In sum, good selection high-quality on day 3 would allow high rate pregnancy transfer one two blastocysts. Good results cryopreservation must part agreement program. If singleton live birthrates were considered principal outcome assisted reproductive technologies reported centers registry, twin triplet rates should also separately. And finally, if financial considerations not limit cost reimbursement procedures, procedures could increased fewer