Ovarian Reserve and Bariatric Surgery

  • End date
    Mar 19, 2025
  • participants needed
  • sponsor
    Assistance Publique - Hôpitaux de Paris
Updated on 19 December 2021
body mass index
follicle stimulating hormone
polycystic ovary syndrome
bariatric surgery
gastric bypass
sleeve gastrectomy
anti-mullerian hormone
in vitro fertilization
antral follicle count
mullerian inhibiting substance


The expansion of the obesity epidemic is accompanied with an increase in bariatric procedures, in particular in women of reproductive age. Severe obesity has negative effects on fertility and on in vitro fertilization (IVF) outcomes, and the weight loss induced by the bariatric surgery (BS) is believed to reverse the deleterious impact of overweight and obesity on female fertility. However, research is limited to retrospective cohort studies, small case-series and case-control studies. Weight reduction has been shown to improve fecundity and hormonal state of a subgroup of obese patients with polycystic ovary syndrome (PCOS). In this population, recent studies have demonstrated an increase of naturally conceived pregnancies following bariatric surgery. However, these studies have evaluated only short-term evolution of ovarian function and not all studies demonstrated improvements in fertility outcomes after BS. Clearly, more studies are needed regarding the effect of BS on obesity-related infertility, and long-term outcome of ovarian function has to be assessed.

Markers of ovarian reserve, including Follicle Stimulating Hormone (FSH), antral follicle count (AFC), and anti-mullerian hormone (AMH), have been used to counsel patients regarding in their reproductive outcomes. Serum AMH concentrations remain remarkably stable throughout the menstrual cycle, which is a great advantage over other markers of fertility. Various studies have evaluated the association between AMH and body mass index (BMI) but reported contradictory results. Some of them have reported a significant inverse correlation between AMH and BMI, but others found no relationship between AMH and BMI. Scarce and small preliminary studies have been performed to evaluate AMH changes after surgical weight loss and showed a decrease in serum AMH.


Medical files of volunteers obese women consulting an endocrinologist nutritionist or a gynaecologist in each center will be screened and women fitting the inclusion criteria will be proposed to participate in the study. These women will be enrolled and matched with obese women with planned bariatric surgery prospectively. The matching for age (± 1 year) and BMI category (BMI 35-39.9 kg/m², 40-49.9 kg/m² and ≥ 50 kg/m²) of each woman in the surgery group with a control woman will be performed globally, i.e. two matched women could belong to the same center or two different centers.

This is a national prospective multicentre cohort study. Obese women with planned BS, matched for presurgical age and BMI with women with no planned BS.

Subjects with planned bariatric surgery will be recruited in the nutrition departments. All consecutive eligible patients will be considered for inclusion.

Obese women with no planned bariatric surgery will be recruited in the same centers than the corresponding women with planned bariatric surgery, but two matched women can belong to two different centers.

All subjects will be followed 36-42 months according to the delay between inclusion and BS, and AMH levels will be measured at baseline or preoperative time, 12, 24 and 36 months after baseline for controls and after BS for operated women.

Condition Bariatric Surgery, Obesity, Reproductive Health, Fertility
Treatment Bariatric Surgery
Clinical Study IdentifierNCT04583150
SponsorAssistance Publique - Hôpitaux de Paris
Last Modified on19 December 2021


Yes No Not Sure

Inclusion Criteria

Obese women with planned surgery (BS group)
Obese women with an indication of bariatric surgery (BMI ≥ 35 kg/m² with an obesity related comorbidity or BMI ≥ 40 kg/m²)
Age 18 to 37 years (inclusion possible until the day before the 37th birthday)
No pregnancy project in the next 12 months
Signed informed consent
Affiliated to The French social security except patient on AME (state medical aid)
Obese women with no planned surgery (control group)
Obese women with BMI ≥ 35 kg/m²
Age 18 to 37 years (inclusion possible until the day before the 37th birthday)
No pregnancy project in the next 12 months
Signed informed consent
Affiliated to the French social security except patient on AME (state medical aid)
Matched for age and BMI category (35-39.9 kg/m², 40-49.9 kg/m² and ≥ 50 kg/m²) with an operated woman
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)
Medical condition known to alter ovarian reserve (previous oophorectomy, ovarian
surgery, chemotherapy, pelvis or hypothalamic radiotherapy, known premature ovarian
insufficiency …)
Pregnant or lactating woman
HIV infection
Contraceptive with antigonadotropic action during the month before inclusion
Previous bariatric surgery
Expected follow up less than 3 years
Absolute contraindication for bariatric surgery (vital risk, anaesthetic
contraindication, non stabilized psychiatric disorder, substance addiction)
Clear my responses

How to participate?

Step 1 Connect with a study center
What happens next?
  • You can expect the study team to contact you via email or phone in the next few days.
  • Sign up as volunteer to help accelerate the development of new treatments and to get notified about similar trials.

You are contacting

Investigator Avatar

Primary Contact



Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

Learn more

If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

Learn more

Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

Learn more

Similar trials to consider


Browse trials for

Not finding what you're looking for?

Every year hundreds of thousands of volunteers step forward to participate in research. Sign up as a volunteer and receive email notifications when clinical trials are posted in the medical category of interest to you.

Sign up as volunteer

user name

Added by • 



Reply by • Private

Lorem ipsum dolor sit amet consectetur, adipisicing elit. Ipsa vel nobis alias. Quae eveniet velit voluptate quo doloribus maxime et dicta in sequi, corporis quod. Ea, dolor eius? Dolore, vel!

  The passcode will expire in None.

No annotations made yet

Add a private note
  • abc Select a piece of text from the left.
  • Add notes visible only to you.
  • Send it to people through a passcode protected link.
Add a private note