A Phase 4 interventional study of GnRH and placebo in Infertility, sponsored by University Reproductive Associates. Active, not recruiting at 1 site in United States. Open to female participants aged 18 Years to 40 Years. Per ClinicalTrials.gov, last updated 2026-10-19.
Sponsored by University Reproductive Associates · Phase 4, Interventional, and Treatment
During IVF cycles an embryo is generally placed into the uterine cavity between 3 and 5 days after fertilization. For a successful pregnancy to take place, that embryo must then implant in the properly primed and staged endometrium, which subsequently must continue to develop to accommodate the growing and maturing embryo and then fetus. This process is normally regulated by hormonal interactions between the fetal, endometrial and luteal tissue. It has been found that after IVF additional support for the endometrium with progesterone improves implantation and subsequent live birth rates in IVF cycle . Recent data has shown that additional supplementation with a single administration of a GnRH agonist around the time the time of embryo transfer may further enhance these rates .
see above
2,085 studies on the registry are indexed under Infertility; 357 are open to participants now.
This study's planned enrollment of 350 is above the median of 135 across 1,412 interventional studies indexed under Infertility.
Browse Infertility studies →University Reproductive Associates is the lead sponsor of 6 studies on the registry; none are open to participants now.
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Exclusion Criteria:
Drug: GnRH
Drug: placebo
single shot of GnRH agonist
placebo
Live birth per transfer
Time frame: 9 months
implantation rates
Time frame: 4 weeks
clinical pregnancy
Time frame: 4 weeks
rates of OHSS
Time frame: 4 weeks
Started Nov 2015 (actual). Primary completion is estimated for Jul 2027, 140 months after the start.
Of 73 non-industry phase 4 interventional studies under Infertility, half reached primary completion within 34 months of starting (the median), counting those still running; a quarter within 19 and three quarters within 82. This study's planned 140 months is above that.
Counting every sponsor, half of 80 studies reached it within 33 months; a quarter within 19 and three quarters within 82.
Since we started tracking on Sep 25, 2026, the dates moved once, on Oct 19, 2026: primary completion Jul 2026 → Jul 2027 and completion Jul 2026 → Nov 2027.
Earlier changes are on the record history on ClinicalTrials.gov ↗
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is active, not recruiting, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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Studies of the drug tested here: Gonadotropin-Releasing Hormone
University Reproductive Associates