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Bariatric Surgery Status Complicating PregnancyGLORIANCT05084339

Glucose Homeostasis, Metabolomics and Pregnancy Outcomes After Bariatric Surgery

An observational study of Bariatric Surgery Status Complicating Pregnancy, run by Universitaire Ziekenhuizen KU Leuven at 8 sites in Belgium.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

The aim of the GLORIA study is to determine whether an altered glucose metabolism (with more hypoglycaemia and glycaemic variability) and altered metabolomics during pregnancy after bariatric surgery contribute to the increased risk for adverse pregnancy outcomes such as small-for-gestational age infants. Read more about this study

Who is it for?
Ages 18 to 45 years, women onlyHealthy volunteers can take part
What is being tested?
CGM
How many people
190 participants
Where
8 sitesBelgium
Study dates
25 Jan 2023to Dec 2026
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 45 years
  • Women only
  • Healthy volunteers accepted
  • Adult

Study population: 95 pregnant women with a history of bariatric surgery (RYBG or SG) and 95 age-and BMO matched pregnant women without history of bariatric surgery

Who may be able to join

  • Age 18-45 years and with a singleton pregnancy with ultrasound-confirmed gestational age up to 11 weeks and 6 days
  • for the group with bariatric surgery: history of gastric bypass (RYBG) or sleeve gastrectomy (SG)
  • Participants need to speak and understand Flemish, French or English and have e-mail access.

Who cannot join

  • multiple pregnancy
  • pregnancy ≥12 weeks
  • other types of bariatric surgery than RYBG or SG
  • known pregestational diabetes
  • a physical or psychological disease likely to interfere with the conduct of the study
  • medications known to interfere with glucose metabolism.

Trial locations and contacts

8 sites in 1 country. Contact the study team or a site near you to ask about taking part.

Katrien Benhalima, MD PhD contact

+3216340614

katrien.benhalima@uzleuven.be

Ellen Deleus, MD contact

ellen.deleus@uzleuven.be

8 sites in 1 country

Belgium8 sites, 8 recruiting
  • OLV-Aalst-Asse

    Aalst

    Inge Van Pottelbergh, MD PhD

    Recruiting
  • UZA

    Antwerp

    Eveline Dirinck, MS PhD

    Recruiting
  • ZNA Antwerpen

    Antwerp

    Astrid Morrens, MD

    Recruiting
  • Imelda Bonheiden

    Bonheiden

    Els Lannoey, MD

    Recruiting
  • AZ St-Jan Brugge

    Bruges

    Anne Loccufier, MD

    Recruiting
  • UZ Gent

    Ghent

    Kristien Roelens, MD PhD

    Recruiting
  • AZ Groeninge Kortrijk

    Kortrijk

    Nele Myngheer

    Recruiting
  • UZ Leuven

    Leuven

    Katrien Benhalima, MD PhD

    Recruiting

Other trials in Belgium

About this study

The aim of the GLORIA study is to determine whether an altered glucose metabolism (with more hypoglycaemia and glycaemic variability) and altered metabolomics during pregnancy after bariatric surgery contribute to the increased risk for adverse pregnancy outcomes such as small-for-gestational age infants. In addition, the investigators also aim to evaluate whether continuous glucose monitoring (CGM) can be used to diagnose gestational diabetes (GDM).

Read the detailed description

The GLORIA study is a Belgian multicenter prospective cohort study. The investigators aim to recruit 95 pregnant women after bariatric surgery (gastric bypass or sleeve gastrectomy) and as a control group, an age and BMI-matched cohort of 95 pregnant women without bariatric surgery. Participants will be recruited before 12 weeks of pregnancy. To evaluate glucose homeostasis, a masked CGM will be used for 10 days during each trimester in pregnancy and at the time of screening for GDM (at 24-28 weeks). The primary outcome is the mean glycaemia levels and glycaemic variability (SD) measured by CGM in pregnancy. At the different time points, anthropometric measurements (including body composition), food diary, questionnaires and micronutrients will be evaluated. In addition, in collaboration with the lab of Cristina Legido Quigle from the Steno Diabetes Center in Copenhagen, metabolomics will be analyzed. Women with a history of bariatric surgery will receive screening for GDM between 24-28 weeks of pregnancy by performing self- monitoring of blood glucose (SMBG) with a glucometer during one week. In addition to SMBG, women will receive a masked CGM during one week.

Being tested
CGM

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • CGMDiagnostic test

    blinded CGM used at 4 different time points in pregnancy

Study groups in NCT05084339
Study groupRoleWhat they receive
pregnant group with bariatric surgerypregnant women with a history of gastric bypass or sleeve gastrectomy
Receives: Diagnostic Test: CGM
matched pregnant group without history of bariatric surgeryage-and BMI matched pregnant women without history of bariatric surgery
Receives: Diagnostic Test: CGM

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. mean glycaemia

    mean glycaemia measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  2. Standard deviation of glycaemia

    SD measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

Secondary outcomes (32)
  1. time <54mg/dl

    time <54mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  2. glycaemic variability measured by coefficient of variation (CV)

    CV measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  3. glycaemic variability measured by mean amplitude of glucose excursions (MAGE)

    MAGE measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  4. time <70mg/dl

    time <70mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  5. time <63mg/dl

    time <63mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  6. time <50mg/dl

    time <50mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  7. low blood glucose index (LBGI)

    low blood glucose index (LBGI) based on CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  8. time > 120mg/dl

    time >120mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  9. time > 140mg/dl

    time >140mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  10. time > 180mg/dl

    time >180mg/dl measured by CGM

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  11. prevalence of gestational diabetes

    gestational diabetes based on capillairy monitoring or oral glucose tolerance test

    Measured: 24-28 weeks of pregnancy

  12. gestational weight gain

    total gestational weight gain in pregnancy

    Measured: at end of pregnancy

  13. preterm delivery

    delivery <37 weeks of pregnancy

    Measured: delivery

  14. cesarean sections

    planned and emergency cesarean sections combined

    Measured: delivery

  15. large-for-gestational age infant

    gestational age adjusted birth weight >90th percentile according to the standardized Flemish birth charts adjusted for parity and sex

    Measured: delivery

  16. small-for-gestational infant

    gestational age adjusted birth weight <10th percentile according to the standardized Flemish birth charts adjusted for parity and sex

    Measured: delivery

  17. neonatal hypoglycaemia

    neonatal hypoglycaemia requiring intravenous dextrose

    Measured: delivery

  18. Neonatal intensive care admission (NICU)

    NICU admission defined as requiring a duration of at least 24 h

    Measured: delivery

  19. gestational hypertension

    gestational hypertension ≥20 weeks of gestation: blood pressure ≥140/90mmHg

    Measured: delivery

  20. pre-eclampsia

    pre-eclampsia [≥20 weeks of gestation: new onset of hypertension and proteinuria or the new onset of hypertension and significant end-organ dysfunction with or without proteinuria (dipstick ≥ 2+, ≥0.3 g protein/24 hours or ≥30 mg/dL protein in spot urine or spot urine protein / creatinine ratio ≥30 mg protein/mmol creatinine)

    Measured: delivery

  21. micronutrient deficiencies

    vitamin A, vitamin D, B12, folate, prothrombin time and iron

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy and 30-34 weeks of pregnancy

  22. body fat percentage women

    body fat measured by bioelectrical impedance analysis

    Measured: between 6-12 weeks of pregnancy

  23. body fat percentage newborns

    body fat calculated by measurements of skinfolds at triceps, flank and subscapular

    Measured: within 3 days after birth

  24. fetal abdominal circumference (AC)

    fetal abdominal circumference (AC) to evaluate fetal body composition

    Measured: at 12, 20, 30 and 34 weeks of gestation

  25. fetal abdominal subcutaneous fat thickness (ASCF)

    fetal abdominal subcutaneous fat thickness (ASCF) to evaluate fetal body composition

    Measured: at 12, 20, 30 and 34 weeks of gestation

  26. placental function

    the pulsatility index (PI) of the Doppler wave in the arteriae uterinae at 12 weeks and in the arteria umbilicalis at 20, 30 and 34 weeks of gestation.

    Measured: at 12, 20, 30 and 34 weeks of gestation

  27. macronutrient intake baseline

    food diary taken in early pregnancy

    Measured: between 6-12 weeks of pregnancy

  28. macronutrient intake in pregnancy

    frequency food questionnaire

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  29. physical activity

    the Kaiser physical activity survey

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  30. symptoms of depression

    the 20-item Center for Epidemiologic Studies-Depression (CES-D) questionnaire

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  31. symptoms of anxiety

    six-item short-form the State-Trait Anxiety Inventory (STAI) questionnaire on anxiety

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

  32. index of quality of life

    36-Item Short Form Health Survey (SF-36) questionnaire

    Measured: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted19 Oct 2021
  2. Study start25 Jan 2023
  3. Primary completionSep 2026 (estimated)
  4. Study completionDec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Prospective
Enrolment
190 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05084339
Sponsor's protocol ID
S65734
Acronym
GLORIA
Status last verified
Apr 2026
First submitted
20 Sep 2021
Last updated
5 May 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Deleus E, Bochanen N, Ceulemans D, Debunne H, Denys B, Devlieger R, Geerts I, Laenen A, Jochems L, Lannoey E, Lannoo M, Loccufier A, Maes T, Marlier J, Morrens A, Myngheer N, Tierens L, Vandenberghe G, Van den Bruel A, Van den Haute L, Van der Schueren B, Van Pottelbergh I, Benhalima K. Glucose Homeostasis, Metabolomics, and Pregnancy Outcomes After Bariatric Surgery (GLORIA): Protocol for a Multicentre Prospective Cohort Study. J Clin Med. 2025 Jul 7;14(13):4782. doi: 10.3390/jcm14134782.

    PubMed 40649156

Questions about this trial

What is this clinical trial studying?

An observational study of Bariatric Surgery Status Complicating Pregnancy, run by Universitaire Ziekenhuizen KU Leuven at 8 sites in Belgium.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 5 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 8 sites in Belgium. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Katrien Benhalima, MD PhD (+3216340614, katrien.benhalima@uzleuven.be), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

mean glycaemia (time frame: between 6-12 weeks of pregnancy, 18-22 weeks of pregnancy, 24-28 weeks of pregnancy and 30-34 weeks of pregnancy). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05084339, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 5 May 2026.

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