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Serological tests showed the patients' FSH were lower than 15 IU/L.
All patients received a long protocol of pituitary down regulation with Alarelin (a kind of Gn RH agonist made by GL Biochem (Shanghai) Ltd, Shanghai, China) 150 mg by s.c.injections once daily from the midluteal phase of the cycle preceding the treatment cycle and received Gonal-F (a highly pure, recombinant form of human follicle stimulating hormone, made by EMD Serono, Inc., Darmstadt, Germany) for ovarian stimulation. when the leading follicle reached 18 mm in diameter and there were at least three follicles of more than 16 mm in diameter.Each patient was evaluated only once during the study period.Of the two to three embryos implanted, at least one was of good quality.Ultrasound measurement of all patients was performed by Dr.
Endometrial receptivity has, for a long time, been the major focus in the field of assisted reproduction because the synchronous changes of the endometrium with embryonic development is the basis for embryonic implantation.