Testing a Conversion Factor for a More Rapidly Acting Insulin in an Automated Insulin Delivery System Among Adolescents With T1D

Completed · Not applicable

Conditions studied: Type 1 Diabetes

In brief

A randomized controlled trial of Control-IQ, assessing glycemic control (time-in-range 70-180 mg/dL) for Lyumjev insulin (in which the insulin settings have been determined using an experimental conversion factor) as compared to Humalog or Novolog (using optimized settings)

Key facts

Study ID

NCT06948760

Run by

Mark D. DeBoer, MD, MSc., MCR

People needed

11

Starts

2025-07-23

Expected to finish

2026-03-10

Last updated by the study team

2026-03-25

Who can join

Age: 12 and older, up to 22. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Age ≥12.0 and ≤22 years old at time of consent
• Clinical diagnosis, based on investigator assessment, of type 1 diabetes for at least one year
• HbA1c >6.5 - 12%
• Currently using insulin for at least six months
• Currently using the Tandem t:slim insulin pump with Control-IQ Technology® for at least two months
• Using insulin parameters such as carbohydrate ratio and correction factors consistently on their pump in order to dose insulin for meals or corrections
• Access to internet and willingness to upload data during the study as needed, including data generated prior to the start of the study
• For females, not currently known to be pregnant or breastfeeding
• If female and sexually active, must agree to use a form of contraception to prevent pregnancy while a participant in the study. A negative serum or urine pregnancy test will be required for all females of childbearing potential. Participants who become pregnant will be discontinued from the study. Also, participants who during the study develop and express the intention to become pregnant within the timespan of the study will be discontinued.
• Willingness to switch to lispro (Humalog) or aspart (Novolog) if not using already, prior to the insulin Optimization Phase and for the duration of the study
• Willingness to use Lyumjev if randomized to the experimental treatment arm
• Total daily insulin dose (TDD) at least 10 U/day and not more than 100 U/day
• Willingness not to start any new non-insulin glucose-lowering agent during the course of the trial (including metformin, GLP-1 agonists, pramlintide, DPP-4 inhibitors, biguanides, sulfonylureas and nutraceuticals)
• Willingness to eat at least 1 g/kg of carbohydrate per day
• Willingness to check ketones per study protocol using home urine ketone strips
• An understanding and willingness to follow the protocol and signed informed consent

You may not qualify if…

• History of diabetic ketoacidosis (DKA) in the 6 months prior to enrollment
• Severe hypoglycemia resulting in seizure or loss of consciousness in the 6 months prior to enrollment
• Current HbA1c <6.5 or >12
• Pregnancy or intent to become pregnant during the trial
• Currently being treated for a seizure disorder
• Planned surgery during study duration
• Need for treatment with oral steroid
• Treatment with any non-insulin glucose-lowering agent (including metformin, GLP-1 agonists, pramlintide, DPP-4 inhibitors, SGLT-2 inhibitors, biguanides, sulfonylureas and nutraceuticals)
• A known medical condition that in the judgment of the investigator might interfere with the completion of the protocol.

Where it is running

• University of Virginia Center for Diabetes Technology — Charlottesville, Virginia, United States

Full record on ClinicalTrials.gov

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