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A Randomized Trial Comparing the Live Birth Rate of Immediate Versus Delayed FET Following a Freeze-all Strategy

Study acronym: FET
StatusActive, Not Recruiting
PhaseNot applicable
Started
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Record status
This record was last updated February 2, 2026 (before its estimated June 1, 2026 completion). Its status may not reflect the trial's current state.

Record History

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  1. Trial status: Recruiting to Active, Not Recruiting
    • Primary completion date: Dec 31, 2025 to Jun 1, 2026
    • Site details revised
    v7
  2. Re-verified, no change to tracked fieldsv6
  3. Primary completion date: May 1, 2024 to Dec 31, 2025
    • Study completion date: Jul 1, 2025 to Jun 30, 2026
    v5
  4. Primary completion date: May 1, 2023 to May 1, 2024
    • Study completion date: Jul 1, 2023 to Jul 1, 2025
    v4
  5. Re-verified, no change to tracked fieldsv3
  6. Trial status: Not Yet Recruiting to Recruiting
    • Start date changed from estimate of May 1, 2020 to May 4, 2020
    • Site details revised
    • Study title shortened, about 3 words
    v2
  7. Study First Submitted
  • Stopped: an ongoing trial was terminated, suspended or withdrawn.
  • Notable: the trial’s plan changed such as a big move in its timeline or size, a new primary endpoint, sponsor or phase, or recruiting opened or resumed.
  • Minor: routine progress and housekeeping, such as sites added or enrollment closed.
This randomized trial we aim to compare the live birth rate of immediate versus delayed FET replacing a single blastocyst in the first FET of the first stimulated IVF cycle following. The hypothesis is that the live birth rate of the immediate FET is higher than the delayed FET replacing a single blastocyst in the first FET of the first stimulated IVF cycle following a freeze-all strategy. Women will undergo IVF/ICSI in the centre as clinically indicated. Standard ovarian stimulation with gonadotrophins in a Gonadotrophin releasing hormone (GnRH) antagonist protocol will be employed. Hormone replacement treatment (HRT) will be used in subsequent FET cycles. On Day 3 of the menstrual cycle, we will measure the anxiety levels using the Chinese State-Trait Anxiety Inventory and serum E2, cortisol levels will be checked on the same day. Recruited women having the first FET cycle following a freeze all strategy will be randomly assigned on the day of blastocyst(s) freezing according to a computer-generated randomization list into one of the following two groups.
Trial Details
NCT Number NCT04371783
Lead Sponsor ShangHai Ji Ai Genetics & IVF Institute
Conditions
(from sponsor)		 IVF, Frozen Embryo Transfer
Enrollment 828 participants
Start Date
Primary Completion (estimated)
Study Completion (estimated)
Updated on ClinicalTrials.gov