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Could your vaginal bacteria decide if IVF works? scientists launch huge study.

NCT ID NCT06643065

Knowledge-focused Sponsor: Fundación IVI Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jul 01, 2026 · Updated 2 times

Summary

This study will test 1,573 women undergoing IVF to see if the types of bacteria in the vagina are linked to pregnancy success. Researchers will collect samples before embryo transfer and analyze the bacterial balance. The goal is to learn whether an imbalance might cause pregnancy failure and if future testing could help improve outcomes.

What this could mean

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

What this could lead to
If successful, this could lead to routine vaginal microbiome testing and treatments to improve IVF success rates.
What could go wrong
This is an observational study, not a treatment trial. It may find no clear link, or the results may not apply to all fertility patients.

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

About 1,573 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jul 2024

Expected to finish

Sep 2027

An estimate. End dates often move.

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

Eligible study participants are female ART patients scheduled for a frozen euploid embryo transfer

Ages

18 to 50 years

Sex

Female participants only

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: * ART patients undergoing the transfer of a euploid embryo Exclusion Criteria: * Patients with a body mass index (BMI) ≥35 * Patients with uncorrected uterine malformations * Patients with a unicornuate uterus * Patients with a bicornuate uterus * Patients with any type of submucosal myoma * Patients with an intramural myoma if ≥4 cm * Patients with severe adenomyosis (\>50% of the uterine corpus affected as defined by the MUSA criteria \[19\]) * Patients undergoing transfer of an embryo with a morphology score \<4BC (according to the Gardner \& Schoolcraft scoring system \[18\]) * Patients undergoing transfer of a day-7 embryo * Patients who took antibiotics in the month prior to the embryo transfer (excluding antibiotics given following oocyte retrieval)

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As listed by the trial registrant

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

Vaginal microbiome

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    10 sites. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. 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

  • Ginefiv Barcelona

    RECRUITING

    Barcelona, 08015, Spain

  • Ginefiv Madrid

    RECRUITING

    Madrid, 28043, Spain

  • Ginemed Sevilla

    RECRUITING

    Seville, 41010, Spain

  • IVI Barcelona

    RECRUITING

    Barcelona, 08029, Spain

  • IVI Bilbao

    RECRUITING

    Bilbao, 48940, Spain

  • IVI Madrid

    RECRUITING

    Madrid, 28023, Spain

  • IVI Málaga

    RECRUITING

    Málaga, 29006, Spain

  • IVI Valencia

    RECRUITING

    Valencia, 46015, Spain

  • IVI Vigo

    RECRUITING

    Vigo, 36203, Spain

  • IVI Zaragoza

    RECRUITING

    Zaragoza, 50018, Spain

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