If a fresh embryo, assisted reproductive technology procedure cycle is unsuccessful and there are frozen embryos av thawed embryo transfer is performed. In some specific cases women may undergo oocyte donation treatment. In bo endometrium is primed by the administration of estrogen and progesterone.
To prevent the possibility of sponta gonadotropin-releasing hormone(GnRH)agonists are frequently used.
Objectives
To evaluate the most effective endometrial preparation for women undergoing transfer with frozen embryos or emb oocytes with regard to the subsequent live birth rate.
Search strategy
We searched the Cochrane Menstrual Disorders and Subfertility Group Trials Register, Cochrane Central Regist Trials (CENTRAL) (The Cochrane Library), MEDLINE, EMBASE, LILACS, and abstracts of reproductive societies inception). No language restrictions were applied. Experts in the field were contacted.
Selection criteria
Randomised controlled trials evaluating endometrial preparation in women undergoing fresh donor cycles and frozen embryo transfers.
Data collection and analysis
Two review authors independently applied the inclusion criteria, assessed trial risk of bias, and extracted data.