Smaller follicles, bigger flexibility? new study tests ovulation timing in IVF
NCT ID NCT07088952
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at whether triggering ovulation when the follicle is 13-16.9mm (instead of the usual 17-22mm) works just as well for frozen embryo transfers. About 572 women with regular cycles will take part. The goal is to make scheduling easier for patients and clinics without lowering pregnancy rates.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 572 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Oct 2025
- Expected to finish
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May 2028
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 50 years
- Sex
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Female participants only
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * At least one expanded blastocyst (regardless of its quality) * Spontaneous menstrual cycles * Consent to undergo frozen embryo transfer in a modified natural cycle Exclusion Criteria: * Abnormal uterine cavity * Fluid in endometrial cavity
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Vida Recoletas Sevilla
RECRUITINGSeville, Sevilla, 41092, Spain
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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- Could a fibroid drug help women with adenomyosis finally achieve a live birth?
- New drug may boost IVF success by thickening uterine lining
- Cervical mucus may hold key to better IVF timing
- New embryo transfer device aims to boost IVF success
- AI embryo selector tested in IVF study