The increasing use of FET emphasizes the importance of preparing and timing the endometrium in FET cycles, however there is no consensus on luteal phase progesterone supplementation in mNC-FET and the optimal day of blastocyst warming and transfer. The aim of this multicenter RCT is to assess the effect of progesterone supplementation in hCG-triggered mNC-FET and the effect of embryo thawing and transfer at hCG+6 or hCG+7 days, respectively. In total 604 patients will be included with n=151 in each of the four study arms. The primary outcome is live birth rate per transfer (LBR) and the goal is to show a 10% increase in LBR after progesterone supplementation and to assess whether blastocyst warming+transfer 6 days after hCG trigger is superior to 7 days after hCG trigger in mNC-FET.
Age range
18 Years – 41 Years
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
Live birth rates per transfer
Timeframe: Registered at the one-year follow-up after a positive pregnancy test.