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Progesterone boost may help IUI success

NCT ID NCT07508657

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 10, 2026 · Updated 2 times

Summary

This study tests whether taking progesterone (a hormone) after intrauterine insemination (IUI) increases the chance of pregnancy in women who also took letrozole to stimulate their ovaries. About 690 women in Denmark will be randomly assigned to receive either progesterone vaginal suppositories or no extra treatment. The goal is to see if this simple addition improves clinical 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

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

About 690 people

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

Started

Aug 2026

Expected to finish

Jan 2030

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.

Ages

18 to 37 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: * Age 18-37 years * Scheduled for IUI with homologous or donor sperm * Undergoing mild ovarian stimulation with letrozole * Ability to provide written informed consent Exclusion Criteria: * Age \> 37 years * Anovulation due to hypogonadotropic hypogonadism * Known hypersensitivity to progesterone or hard fat listed as an excipient in the Summary of Product Characteristics (SmPC) for Cyclogest. * Known or suspected progesterone-sensitive malignant tumours * Porphyria * Known missed abortion or ectopic pregnancy * Active arterial or venous thromboembolism, severe thrombophlebitis, or a history of these conditions * Severe hepatic dysfunction or liver disease * Inability to speak or understand Danish sufficiently to comprehend oral and written study information

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Conditions

The condition(s) this trial relates to.

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.

  1. The places running it

    4 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

  • Copenhagen University Hospital - Rigshospitalet. Department of Gynecology, Fertility and Obstetrics

    NOT_YET_RECRUITING

    Copenhagen, 2100, Denmark

  • The Fertility Clinic, Herlev Hospital

    NOT_YET_RECRUITING

    Herlev, 2730, Denmark

  • The Fertility Clinic, Hvidovre Hospital

    NOT_YET_RECRUITING

    Hvidovre, 2650, Denmark

  • University Clinic for Fertility, Horsens Regional Hospital, Central Denmark Region

    RECRUITING

    Horsens, 8700, Denmark

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