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Can bariatric surgery boost fertility in obese men?

NCT ID NCT01842295

Knowledge-focused Sponsor: Assistance Publique - Hôpitaux de Paris Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026

Summary

This study looked at 46 obese men aged 18 to 50 who were scheduled for weight-loss surgery (gastric banding, bypass, or sleeve gastrectomy). Researchers measured changes in sperm quality and other fertility-related factors before and after surgery. The goal was to understand if losing weight through surgery could improve a man's ability to father children.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
bariatric surgery (gastric banding, bypass, sleeve gastrectomy)
What this could lead to
If successful, this study could show that weight-loss surgery improves sperm quality, potentially helping obese men with fertility issues.
What could go wrong
This is a small, completed observational study with only 46 participants. Results may not apply to all men, and the study does not test a new treatment.

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

46 people

The number who actually took part.

Started

Feb 2013

Finished

Mar 2016

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 50 years

Sex

Male 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: * Obese men with BMI ≥ 40kg/m² or 35 kg/m² with associated co-morbidities * Selected for bariatric surgery by multidisciplinary team * From 18 to 50 years old included * With a first medical consultation and its results * With their written informed consent to participate in the study * No problem for understanding verbal or written French * An affiliation to social security Exclusion Criteria: * Not candidates for surgery * With non idiopathic alteration of spermatogenesis

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Conditions

The condition(s) this trial relates to.

Obesity obesity disorder

As listed by the trial registrant

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

Bariatric surgery Obesity

Contacts and locations

Locations

  • Jean Verdier Hospital

    Bondy, 93140, France

More trials for these conditions

Other studies related to the condition(s) this trial covers.