HbA1c Variation Study
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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT05189938 |
Recruitment Status :
Recruiting
First Posted : January 13, 2022
Last Update Posted : February 1, 2023
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Condition or disease | Intervention/treatment |
---|---|
Diabetes Mellitus | Diagnostic Test: HBA1c data and glucose levels |
Study Type : | Observational |
Estimated Enrollment : | 600 participants |
Observational Model: | Cohort |
Time Perspective: | Prospective |
Official Title: | HbA1c Variation Study |
Actual Study Start Date : | December 20, 2021 |
Estimated Primary Completion Date : | December 2023 |
Estimated Study Completion Date : | December 2023 |
- Diagnostic Test: HBA1c data and glucose levels
All subjects will wear the professional FreeStyle Libre Pro for glucose data and HbA1c data will be collected at different time points over the participation period.
- Establish a relationship between laboratory-derived HbA1c and average glucose levels [ Time Frame: six (6) months ]This is an observational data collection study, where the goal is to gather data to establish the relationship between laboratory-derived HbA1c and average glucose levels.

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 4 Years and older (Child, Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Sampling Method: | Non-Probability Sample |
Inclusion Criteria:
- Subject must have type 1 or type 2 diabetes.
- Subject is at least 4 years old.
- Point-of-care (POC) HbA1C of 3.0%-15.5% (9 mmol/mol - 146 mmol/mol)
- Subject must be able to read and understand English.
- In the investigator's opinion, the subject must be able to follow the instructions provided to him/her by the study site and perform all study tasks as specified by the protocol.
- Subject must be available to participate in all study visits.
- Subject must be willing and able to provide written signed and dated informed consent.
- Subjects age 4 - 17: Parent or guardian must be willing and able to provide written signed and dated informed consent.
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Subjects age 11 - 17 Subject must be willing and able to provide written signed and dated informed assent.
Exclusion Criteria:
- Subject is currently undergoing dialysis or planning to receive dialysis during the course of the study
- History of blood transfusion in the last 3 months or planned blood transfusion during the course of the study.
- Subject is currently planning to undergo a major medical intervention expected to significantly alter red cell life span, i.e. chemotherapy, major surgery requiring blood transfusions, etc.
- Subject has known allergy to medical grade adhesive or isopropyl alcohol used to disinfect skin.
- Subjects age 18 and older: Subject is known to be pregnant, attempting to conceive or is not willing and able to practice birth control during the study duration study (applicable to female subjects only). Subjects age 17 and younger: Subject is known to be pregnant at the time of study enrollment or is planning to become pregnant during the study (applicable to female subjects only).
- Subject has extensive skin changes/diseases at the proposed application sites that could interfere with device placement or the accuracy of interstitial glucose measurements. Such conditions include, but are not limited to extensive psoriasis, recent burns or severe sunburn, extensive eczema, extensive scarring, dermatitis herpetiformis, skin lesions, redness, infection or edema.
- Subject has a pacemaker or any other neurostimulators.
- Subject has concomitant medical condition which, in the opinion of the investigator, could present a risk to the safety or welfare of the subject or study staff.
- Subject is currently participating in another interventional clinical trial.
- Subject is unsuitable for participation due to any other cause as determined by the Investigator.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT05189938
Contact: Mohamed Nada, PhD | 5107495416 | ADC.Clinical@abbott.com |
United States, Montana | |
Billings Clinic | Recruiting |
Billings, Montana, United States, 59101 | |
Contact: Haleigh James, MD | |
United States, Washington | |
Eastside Research Associates | Recruiting |
Redmond, Washington, United States, 98052 | |
Contact: Kevin Hanson, MD | |
United Kingdom | |
University Hospital Birmingham | Not yet recruiting |
Birmingham, United Kingdom, B9 5PU | |
Contact: Wasim Hanif | |
Bradford Royal Infirmary | Not yet recruiting |
Bradford, United Kingdom, BD9 6RJ | |
Contact: Donald Whitelaw | |
Royal Derby Hospital | Recruiting |
Derby, United Kingdom, DE22 3NE | |
Contact: Emma Wilmot | |
Edinburgh Royal Infirmary | Recruiting |
Edinburgh, United Kingdom, EH1 3EG | |
Contact: Fraser Gibb | |
Northwick Park Hospital | Recruiting |
Harrow, United Kingdom, HA1 3UJ | |
Contact: Nilanjana Ray | |
Hull Royal Infirmary | Recruiting |
Hull, United Kingdom, HU3 2JZ | |
Contact: Thozhukat Sathyapalan | |
St James University Hospital | Recruiting |
Leeds, United Kingdom, LS9 7TF | |
Contact: Ramzi Ajjan | |
Leicester General Hospital | Recruiting |
Leicester, United Kingdom, LE1 5WW | |
Contact: Pratik Choudhary | |
Manchester Royal Infirmary | Recruiting |
Manchester, United Kingdom, M13 9WL | |
Contact: Lalantha Leelarathna | |
Nottingham Children's Hospital & Queen's Medical Centre | Recruiting |
Nottingham, United Kingdom, NG7 2UH | |
Contact: Tabitha Randell | |
Royal Berkshire Hospital | Recruiting |
Reading, United Kingdom, RG1 5AN | |
Contact: Foteini Kavvoura | |
Northern General Hospital | Recruiting |
Sheffield, United Kingdom, S10 2SB | |
Contact: Jackie Elliot | |
Ealing Hospital | Recruiting |
Southall, United Kingdom, UB1 3HW | |
Contact: Kevin Baynes | |
The Royal London Hospital | Recruiting |
Whitechapel, United Kingdom, E1 1FR | |
Contact: Craig Stiles |
Study Director: | Shridhara A Karinka, PhD | Abbott Diabetes Care |
Responsible Party: | Abbott Diabetes Care |
ClinicalTrials.gov Identifier: | NCT05189938 |
Other Study ID Numbers: |
ADC-US-RES-21212 |
First Posted: | January 13, 2022 Key Record Dates |
Last Update Posted: | February 1, 2023 |
Last Verified: | November 2022 |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Professional FreeStyle Libre Flash Glucose Monitoring System HBA1C |