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Egg freezing showdown: does the type of freezing medium affect pregnancy?

NCT ID NCT07288866

Knowledge-focused Sponsor: University Hospital, Clermont-Ferrand Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at whether using a special freezing medium designed just for eggs, versus a universal medium for all stages, affects pregnancy rates in egg donation. Researchers analyzed data from 111 donor cycles. The goal is to see if the type of freezing medium makes a difference in how many eggs survive thawing and lead to a pregnancy.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Vitrification and warming media
What this could lead to
If successful, this could help fertility clinics choose the best freezing method for donor eggs, potentially improving pregnancy success rates.
What could go wrong
This is a small, completed study with 111 participants, so results may not apply to all clinics or patient groups. The difference between media types may be small or not clinically meaningful.

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.

Participants

111 people

The number who actually took part.

Started

Jul 2015

Finished

Aug 2021

Lead sponsor

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.

Who is studied

Oocyte recipient couples undergoing an oocyte donation ICSI

Ages

18 to 43 years

Sex

Anyone

Healthy volunteers

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

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Recipient couples undergoing an oocyte donation ICSI cycle from March 2016 to July 2020 for whom the allocated oocytes were vitrified in our center between July 2015 and January 2020 Exclusion Criteria: * Recipient couples undergoing an oocyte donation ICSI cycle from March 2016 to July 2020 for whom the allocated oocytes were vitrified prior to July 2015 or after January 2020.

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Conditions

The condition(s) this trial relates to.

female infertility infertility disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Infertility Infertility, female

Contacts and locations

Locations

  • CHU Clermont-Ferrand

    Clermont-Ferrand, Auvergne, 63003, France

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