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Could your gut bugs predict IVF success?

NCT ID NCT07532629

Knowledge-focused Sponsor: Karolinska Institutet 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026

Summary

This study looks at how the natural microbes and chemical profiles in couples' bodies relate to IVF outcomes. Researchers will collect samples from 1000 couples and track whether they have a baby, miscarriage, or other pregnancy results. The goal is to find patterns that might help predict success, but this is an observation-only study with no treatment given.

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 help identify microbial or metabolic markers that predict IVF success, potentially guiding future fertility treatments.
What could go wrong
This is an observational study, not a treatment trial. It cannot prove cause and effect, and results may not lead to immediate clinical changes.

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 1,000 people

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

Started

Jun 2022

Expected to finish

Mar 2029

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

Couples undergoing in vitro fertilization (IVF) treatment at participating fertility clinics in Sweden. Eligible couples are consecutively recruited at the time of IVF treatment initiation and followed prospectively for reproductive outcomes through linkage with national health registers.

Ages

18 to 40 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Women aged 18 to 40 years at enrolment. * Men aged between 18 to 56 years at enrolment. * Couples planning to undergo IVF treatment at a participating centre. * Sufficient understanding of spoken and written Swedish or English to provide informed consent and complete the web-based questionnaire. Exclusion Criteria: * Pregnancy at the time of enrolment (confirmed or suspected). * Recent systemic antibiotic use within the past 4 weeks * Active vaginal or genital tract infection at the time of sampling

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Conditions

The condition(s) this trial relates to.

Abortion, Spontaneous infertility disorder pregnancy disorder

As listed by the trial registrant

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

Assisted reproductive technology Infertility Metabolome Microbiome Pregnancy complications Pregnancy loss, early

How to take part

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

  1. The places running it

    3 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

  • Karolinska Universitetssjukhuset

    RECRUITING

    Stockholm, 146 32, Sweden

  • Reproduktionscenter, Akademiska sjukuhset

    RECRUITING

    Uppsala, Sweden

  • Reproduktionsmottagning Malmö, Skånes universitetssjukhus

    RECRUITING

    Malmö, Sweden

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