Evaluation of the effect of adding a single dose of gonadotropin releasing hormone agonist (GnRHa) as a luteal phase support on the outcomes of intracytoplasmic sperm injection (ICSI) following GnRH antagonist protocol

Endometrial preparation for embryo transfer (ET) will be started after oocyte retrieval by giving 800 mg/day natural progesterone vaginal supplement + 4 mg/day estradiol oral supplement. The patients will be randomly divided into 2 groups for luteal phase support: (i) Group A (GnRHa group) in which the luteal phase support will be continued by the same regimen started on the day of oocytes retrieval until 2 weeks after embryo transfer (ET) with subcutaneous administration of a single dose (0.2 mg) of GnRHa (Triptorelin) 6 days after oocyte retrieval, and (ii) Group B (control group) in which the luteal phase support will be continued only by the same regimen started on the day of oocytes retrieval until 2 weeks after ET

Inclusion Criteria:

• Women subjected to ICSI through controlled ovarian hyperstimulation (COH) with pituitary downregulation by GnRH antagonist.

Exclusion Criteria:

• Moderate or severe endometriosis.
• Hydrosalpinx.
• Uterine abnormalities.
• Myoma.
• Previous uterine surgery.