Flash Glucose Monitoring Targets in Gestational Diabetes (FlaG-TaG)

August 18, 2025 updated by: University Medical Centre Ljubljana
The use of glucose monitoring sensors is already well-established in pregnant women with type 1 diabetes (T1D), where it has been proven to improve glycemic control and perinatal outcomes. However, it has not yet been sufficiently researched in the area of gestational diabetes (GDM). Some smaller studies have shown a favorable effect on glycemic control, but no statistically significant differences were observed in reducing perinatal complications. A randomized, prospective study will include 200 pregnant women with GDM, treated at the Diabetes Outpatient Clinic of the Clinical Department of Endocrinology, Diabetes, and Metabolic Diseases at the University Medical Centre Ljubljana. Participants will be divided into two groups. The first group will measure subcutaneous glucose using FSL in addition to self-monitoring of blood glucose (SMBG) while fasting and 60 minutes after main meals at the same time intervals. In both groups, glycemic targets, maternal outcomes, and neonatal outcomes will be monitored. In the FSL + SMBG group, sensor parameters for glycemic control will also be tracked.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
205

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • Slovenia
      • Ljubljana, Slovenia, 1000
        • University Medical Centre Ljubljana

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Pregnant women treated at the Diabetes Outpatient Clinic of the Clinical Department of Endocrinology, Diabetes, and Metabolic Diseases for gestational diabetes (GDM),
  2. Agreement with the study protocol and ability to follow the study protocol,
  3. Diagnosis of GDM established using the standard recommended OGTT method between the 24th and 28th weeks of pregnancy,
  4. Age between 18 and 40 years.

Exclusion Criteria:

  1. History of bariatric surgery,
  2. Treatment with systemic corticosteroids for more than 14 days prior to inclusion in the study,
  3. Multiple pregnancy,
  4. Hospitalization for psychiatric illness within the last year,
  5. First visit to the Diabetes Outpatient Clinic after the 34th week of gestation.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Pregnant women with GDM using FGM and SMBG
Pregnant women with GDM using Flash Glucose Monitoring (FGM) and Self-Monitoring of Blood Glucose (SMBG)
Device: Use of FreeStyle Libre 14 day Flash Glucose Monitoring System
Women with GDM in the intervention arm will use Flash Glucose Monitoring (FGM) from diagnosis until the end of pregnancy
Active Comparator: Pregnant women with GDM using only SMBG
Other: No intervention
Only using SMBG

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Glycemic control
Time Frame: Up to delivery
Average Fasting Glucose Concentration: Measured in mmol/L, calculated from fasting blood glucose readings and average Postprandial Glucose Concentration: Measured in mmol/L, based on glucose readings taken 60 minutes after main meals.
Up to delivery

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Mean Glucose (MG) in FSL+ SMBG group
Time Frame: Up to delivery
Measured in millimoles per liter (mmol/L), reflecting the average glucose level recorded by the sensor.
Up to delivery
Mean Amplitude of Glycemic Excursions (MAGE) (FSL+SMBG group)
Time Frame: Up to delivery
Measured in millimoles per liter (mmol/L), representing glycemic variability.
Up to delivery
Time in Range - TIR (SMBG+FSL group)
Time Frame: Up to delivery
Defined as the percentage (%) of time sensor glucose levels fall between 3,5 and 7,8 mmol/l
Up to delivery
Adherence to the Intervention
Time Frame: Up to delivery
Measured as the percentage (%) of completed prescribed self-monitoring and sensor glucose readings relative to the total number of prescribed measurements.
Up to delivery
Gestational Weight Gain (GWG)
Time Frame: Up to delivery
Measured in kilograms (kg), calculated as the difference between pre-pregnancy weight and the last recorded weight before delivery.
Up to delivery
Mode of Delivery
Time Frame: At delivery
Categorized into vaginal delivery, assisted vaginal delivery, or cesarean section, and reported as percentages (%) for each category.
At delivery
Occurrence of Hypertensive Disorders
Time Frame: Up to delivery
Reported as a binary outcome (Yes/No), based on clinical diagnosis during pregnancy.
Up to delivery
Birth Weight
Time Frame: At birth of infant
Measured in grams (g), recorded immediately after delivery
At birth of infant
Large-for-Gestational-Age (LGA) Infant
Time Frame: At birth of infant
Defined as birth weight above the 90th percentile for gestational age, reported as a binary outcome (Yes/No).
At birth of infant
Small-for-Gestational-Age (SGA) Infant
Time Frame: At birth of infant
Defined as birth weight below the 10th percentile for gestational age, reported as a binary outcome (Yes/No).
At birth of infant
Gestational Age at Birth
Time Frame: At birth of infant
Measured in completed weeks, based on the interval from the first day of the last menstrual period or ultrasound-confirmed dating.
At birth of infant
Neonatal Hypoglycemia
Time Frame: At birth of infant
Defined as blood glucose levels below 2.6 mmol/L in the first 48 hours of life, reported as a binary outcome (Yes/No).
At birth of infant
Pregnancy loss
Time Frame: <28 days of life
Miscarriage, stillbirth, neonatal death
<28 days of life
Hyperbilirubinemia
Time Frame: Within first 7 days of life
Treated with phototherapy
Within first 7 days of life

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University Medical Centre Ljubljana

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 1, 2022

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
February 1, 2025

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 1, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 4, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 8, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 14, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 19, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 18, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 0120-449/2021/15

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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