Progesterone boost may help IUI success
NCT ID NCT07508657
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
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Phase 4
Runs after approval, following long-term safety and how well the treatment works in everyday use.
- Participants
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About 690 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Aug 2026
- Expected to finish
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Jan 2030
An estimate. End dates often move.
- Lead sponsor
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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
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18 to 37 years
- Sex
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Female participants only
- Healthy volunteers
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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 Hide 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.
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The places running it
4 sites. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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Copenhagen University Hospital - Rigshospitalet. Department of Gynecology, Fertility and Obstetrics
NOT_YET_RECRUITINGCopenhagen, 2100, Denmark
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The Fertility Clinic, Herlev Hospital
NOT_YET_RECRUITINGHerlev, 2730, Denmark
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The Fertility Clinic, Hvidovre Hospital
NOT_YET_RECRUITINGHvidovre, 2650, Denmark
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University Clinic for Fertility, Horsens Regional Hospital, Central Denmark Region
RECRUITINGHorsens, 8700, Denmark
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