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Could bacteria in the womb explain recurrent miscarriage?

NCT ID NCT05510622

Knowledge-focused Sponsor: Mỹ Đức Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at the bacteria living in the vagina and womb of women who have had two or more miscarriages. Researchers want to see if these bacterial communities differ from those in fertile women. The goal is to understand if the microbiome plays a role in recurrent pregnancy loss. One hundred women will provide samples during a specific phase of their menstrual cycle.

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 bacterial patterns linked to recurrent pregnancy loss, pointing toward future diagnostic or treatment approaches.
What could go wrong
This is an observational study with no treatment, so it won't directly improve pregnancy outcomes. Results may not lead to clear 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 100 people

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

Started

Dec 2022

Expected to finish

May 2026

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

For RPL women: having ≥ 2 recurrent pregnancy loss. For NF women: having ≥ 1 live birth, with no history of pregnancy loss

Ages

18 to 38 years

Sex

Female participants only

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.

1. Recurrent pregnancy loss patients Inclusion Criteria: * 18-38 years old * Having a regular menstrual cycle, from 25 to 35 days * Having ≥ 2 recurrent pregnancy loss and * Couples with normal karyotype results * Having no condition causing pregnancy loss such as antiphospholipid syndrome, abnormal thyroid function. * Agree to participate in the study Exclusion Criteria: * Irregular menstrual cycle * Having uterine abnormalities (e.g., adenomyosis, intrauterine adhesions, unicornuate/ bicornuate/ arcuate uterus; unremoved hydrosalpinx, endometrial polyp, submucosal fibroid) * Using intrauterine device within the last 3 months * Using antibiotic/vaginal pessary/contraceptive pills within 2 weeks * Having sexual intercourse within 48 hours 2. Healthy control patients Inclusion Criteria: * 18-38 years old * Having a regular menstrual cycle, from 25 to 35 days * No history of pregnancy loss * Having 1 or more live birth, with the youngest child ≥ 6 months old * Agree to participate in the study Exclusion Criteria: * Irregular menstrual cycle * Having uterine abnormalities (e.g., adenomyosis, intrauterine adhesions, unicornuate/ bicornuate/ arcuate uterus; unremoved hydrosalpinx, endometrial polyp, submucosal fibroid) * Using intrauterine device within the last 3 months * Using antibiotic/vaginal pessary/contraceptive pills within 2 weeks * Having sexual intercourse within 48 hours

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Conditions

The condition(s) this trial relates to.

habitual spontaneous abortion pregnancy loss, recurrent, susceptibility

As listed by the trial registrant

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

Recurrent pregnancy loss, not pregnant 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

    2 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

  • My Duc Hospital

    RECRUITING

    Ho Chi Minh City, Ho Chi Minh City, 70000, Vietnam

  • My Duc Phu Nhuan Hospital

    RECRUITING

    Ho Chi Minh City, Ho Chi Minh City, 70000, Vietnam

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