Clinical trial Recruiting at 6 sites Observational Ages 18 to 37 Women only

Impact of Bariatric Surgery on Ovarian Reserve in Obese Women

Official title: Evolution of Ovarian Reserve in Severely Obese Women After Bariatric Surgery

Run by Assistance Publique - Hôpitaux de Paris · NCT04583150 · Data updated 2026-11-12

This study is testing how bariatric surgery affects the fertility potential of obese women aged 18 to 37 by looking at changes in their hormone levels over a few years.

More Obesity trials

Quick facts

Study typeObservational
Ages18 Years to 37 Years
SexWomen only
Enrollment238 (estimated)
SponsorAssistance Publique - Hôpitaux de Paris
Academic / other
Drugs / interventionschemotherapy
Locations14 sites (Angers and 13 other locations)
StatusRecruiting
StartedDecember 3, 2020
Main results expectedJune 2025
Study endsMarch 2028
Registry record updatedFebruary 15, 2024
Trial IDNCT04583150 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are obese women aged 18 to 37 with a BMI of 35 or higher, either planning to undergo bariatric surgery or not.

Probably not a fit

Patients who are not obese or those who are pregnant or planning pregnancy within the next 12 months may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This observational study aims to evaluate the effects of bariatric surgery on ovarian reserve in obese women aged 18 to 37. It will involve matching women who are planning to undergo bariatric surgery with those who are not, based on age and BMI categories. Participants will be followed for 36-42 months, during which their Anti-Müllerian Hormone (AMH) levels will be measured at various intervals to assess changes in ovarian function. The study seeks to provide insights into how weight loss from surgery may influence fertility outcomes in this population.

Why it matters

Potential benefit: If successful, this study could provide valuable information on how bariatric surgery may improve fertility in obese women.

How similar studies have gone: Previous studies have shown some success in understanding the relationship between bariatric surgery and fertility, but this study aims to provide more comprehensive and prospective data.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

Obese women with planned surgery (BS group)

1. Obese women with an indication of bariatric surgery (BMI ≥ 35 kg/m² with an obesity related comorbidity or BMI ≥ 40 kg/m²)
2. Age 18 to 37 years (inclusion possible until the day before the 37th birthday)
3. No pregnancy project in the next 12 months
4. Signed informed consent
5. Affiliated to The French social security except patient on AME (state medical aid)

Obese women with no planned surgery (control group)

1. Obese women with BMI ≥ 35 kg/m²
2. Age 18 to 37 years (inclusion possible until the day before the 37th birthday)
3. No pregnancy project in the next 12 months
4. Signed informed consent
5. Affiliated to the French social security except patient on AME (state medical aid)
6. Matched for age and BMI category (35-39.9 kg/m², 40-49.9 kg/m² and ≥ 50 kg/m²) with an operated woman
7. No bariatric surgery project in the next 12 months

Exclusion Criteria:

For both groups : Obese women with planned bariatric surgery (BS group) and obese women with no planned surgery (control group):

1. Medical condition known to alter ovarian reserve (previous oophorectomy, ovarian surgery, chemotherapy, pelvis or hypothalamic radiotherapy, known premature ovarian insufficiency …)
2. Contraceptive with antigonadotropic action during the month before inclusion
3. Pregnant or lactating woman
4. HIV infection
5. Previous bariatric surgery
6. Expected follow up less than 3 years
7. Absolute contraindication for bariatric surgery (vital risk, anaesthetic contraindication, non stabilized psychiatric disorder, substance addiction)

Where it's running

  • CHU Angers
    Angers, France
    Recruiting
  • CHU Clermont Ferrand -Site Gabriel Montpied
    Clermont-Ferrand, France
    Recruiting
  • AP-HP - Hôpital Louis Mourier
    Colombes, France
    Recruiting
  • AP-HP - Groupe Hospitalier Pitié Salpêtrière
    Paris, France
    Recruiting
  • AP-HP - Groupe Hospitalier Pitié Salpêtrière
    Paris, France
    Recruiting
  • 002 CHU Toulouse -Hôpital Rangueil
    Toulouse, France
    Recruiting
Show 8 more locations
  • CHU Dijon Bourgogne - Hôpital Le Bocage Sud
    Dijon, France
    Not yet recruiting
  • CHU Grenoble-CSO Grenoble-Arc Alpin
    Grenoble, France
    Not yet recruiting
  • CHRU Lille -Hôpial Claude Huriez
    Lille, France
    Not yet recruiting
  • HCL - Hôpital Lyon -Sud
    Lyon, France
    Not yet recruiting
  • AP-HM - Hôpital Nord
    Marseille, France
    Not yet recruiting
  • CHU Montpellier Hôpital Lapeyronie
    Montpellier, France
    Not yet recruiting
  • CHU Nantes - Hôpital Nord Laennec
    Nantes, France
    Not yet recruiting
  • AP-HP - Hôpital Europeen Georges Pompidou
    Paris, France
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.