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Fertility treatment and blood clot risk: new study investigates

NCT ID NCT04166825

Knowledge-focused Sponsor: Jagiellonian University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 different ovarian stimulation protocols affect blood clotting in 300 infertile women, including those with endometriosis. Researchers will measure clot formation and breakdown before and after treatment. The goal is to understand which protocols may be safer in terms of clotting risk.

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 doctors choose safer ovarian stimulation protocols for infertile women, especially those with endometriosis.
What could go wrong
This is an observational study, not a treatment trial. It only measures changes in blood clotting, so it won't directly improve fertility or health outcomes.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 300 people

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

Started

Nov 2019

Expected to finish

Jan 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.

Ages

18 to 40 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: * infertility defined based on the WHO 2010 criteria Exclusion Criteria: * ovarian involvement * oral contraceptives use within previous 3 months * dienogest therapy within 3 months until ART * thrombotic events in the medical history * severe hypertension * diabetes mellitus * the presence of known VTE risk factors, including obesity, recent major surgery with prolonged immobilization or trauma, * deficiency of antithrombin, protein C or protein S, * antiphospholipid syndrome, * known malignancy, * any chronic inflammatory diseases (e.g. rheumatoid arthritis) * advanced chronic renal disease (estimated glomerular filtration rate \[eGFR\] \<30 ml/min), * international normalized ratio (INR) more than 1.2 at the day of blood draw * pregnancy.

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Conditions

The condition(s) this trial relates to.

endometriosis female infertility infertility disorder thrombotic disease

As listed by the trial registrant

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

Endometriosis Fibrin blood clot Infertility, female

How to take part

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

  1. The places running it

    1 site. 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

  • Department of Gynecological Endocrinology Jagiellonian University Medical College

    RECRUITING

    Krakow, Małopolska, 30-501, Poland

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