# Transition of Type 1 Diabetes Care
## Overview
Type 1 diabetes mellitus (T1DM) is one of the most common chronic diseases requiring transition from pediatric to adult care. The shift involves not only a change in providers but also differences in management philosophy, glycemic targets, psychosocial support structures, and technology utilization. Poor transition is associated with increased A1c, DKA hospitalizations, and loss to follow-up.
## Epidemiology
T1DM affects approximately 1.6 million Americans, with ~187,000 under age 20. Incidence is increasing worldwide at 3-5% per year, particularly in children under 5. Peak transition period: ages 18-25. Loss to follow-up rates during transition range from 15-40%. A1c often worsens by 0.5-1.0% during the transition period. DKA hospitalization rates spike in the 18-30 age group.
## Key Differences Between Pediatric and Adult T1DM Care
| Domain | Pediatric Approach | Adult Approach |
|--------|-------------------|----------------|
| Philosophy | Family-centered, developmental stage-appropriate, emphasis on growth | Patient-autonomy centered, assumes self-management capability |
| Visit Frequency | Every 3 months with multidisciplinary team | Every 4-6 months with fewer ancillary services |
| Glycemic Target | A1c <7.0% (ADA/ISPAD) | A1c <7.0% (individualize to <6.5% or <8.0%) |
| Preferred Metric | Time-in-range >70% (70-180 mg/dL) with CGM | Time-in-range >70% (70-180 mg/dL) with CGM |
| Psychosocial Support | Diabetes educators, social workers, child life, psychology embedded | Fewer embedded resources; mental health addressed separately |
| Technology Familiarity | High comfort with pump/CGM initiation | Variable; some less familiar with pediatric protocols |
### Management Philosophy
Pediatric approach: family-centered, developmental stage-appropriate, emphasis on growth and development. Adult approach: patient-autonomy centered, assumes self-management capability. Pediatric teams often provide more frequent contact (every 3 months) with multidisciplinary teams. Adult endocrinology clinics may see patients every 4-6 months with fewer ancillary services.
### Glycemic Targets
Pediatric (ADA/ISPAD): A1c <7.0% for all ages (previously had relaxed targets for younger children) Adult (ADA): A1c <7.0% for most; can individualize to <6.5% or <8.0%. Time-in-range (TIR): >70% between 70-180 mg/dL is now the preferred metric with CGM use. Controversy: whether to immediately tighten targets at transfer or allow a "settling in" period to prevent burnout.
### Psychosocial Support
Pediatric: diabetes educators, social workers, child life specialists, psychology readily available. Adult: fewer embedded psychosocial resources, mental health often addressed separately. Diabetes distress affects 20-40% of young adults with T1DM. Disordered eating ("diabulimia" -- insulin restriction for weight loss) peaks in late adolescence/young adulthood.
### Technology
Continuous glucose monitors (CGMs): Dexcom, Libre, Medtronic Guardian. Insulin pumps: Omnipod, Tandem t:slim, Medtronic. Automated insulin delivery (AID) / hybrid closed-loop systems. Technology adoption may differ between pediatric and adult practices. Some adult endocrinologists are less familiar with pediatric pump/CGM initiation protocols. Insurance coverage and formulary changes at age 18 or 26 may disrupt technology access.
## Transition Readiness in T1DM
### Essential Self-Management Skills
Carbohydrate counting and insulin dose calculation; Hypoglycemia recognition and treatment (including glucagon use); Sick day rules (never stop basal insulin, check ketones, when to go to ED); Pump troubleshooting and site changes; CGM sensor insertion and calibration; Prescription refills and pharmacy navigation; Understanding insurance coverage and prior authorizations.
### Assessment Tools
TRAQ (Transition Readiness Assessment Questionnaire) Diabetes-specific self-management checklists. Readiness should be assessed annually starting at age 14-16.
## Barriers to Successful Transition
### Patient-Level
Diabetes burnout and fatigue; Competing priorities (college, employment, social life); Mental health comorbidities (depression, anxiety, eating disorders); Substance use (alcohol and its effect on glucose); Sense of invincibility and risk-taking behavior in emerging adulthood.
### System-Level
Insurance transitions (aging off parents' plan at 26, Medicaid redetermination at 18) Geographic relocation for college or employment. Different EMR systems between pediatric and adult practices. Long wait times for new patient adult endocrinology appointments. Loss of established relationships with pediatric team.
### Provider-Level
Pediatric providers reluctant to discharge long-term patients. Adult providers unfamiliar with technology initiated in childhood. Different communication styles and expectations.
## Best Practices for Transition
### Pre-Transfer Phase (Age 14-17)
Introduce concept of transition early; Begin seeing patient alone for part of the visit; Gradually shift responsibility from parents to patient; Teach self-management skills incrementally; Develop a written transition plan; Prepare a portable diabetes medical summary.
### Transfer Phase (Age 18-21)
Identify adult endocrinologist and schedule appointment before discharge from pediatric practice. Provide warm handoff with direct communication between providers; Transfer diabetes technology data and download history; Ensure insurance continuity; Consider overlap period with both teams.
### Post-Transfer Phase
Confirm attendance at first adult visit; Follow-up contact from pediatric team at 3 and 6 months; Provide a "safety net" period where patients can contact either team; Track outcomes (A1c, DKA events, appointment adherence).
## Emerging Models of Transition Care
Young adult diabetes clinics (bridge clinics, ages 16-25); Med-Peds continuity clinics that span the transition age; Telehealth-enabled transition support; Peer mentoring programs; Transition coordinators embedded in diabetes centers; Digital health platforms for remote monitoring during transition.
## Acute Complications During Transition
DKA risk is highest in the 18-25 age group. Causes: insulin omission, pump failure without backup plan, alcohol use, financial barriers to insulin. Severe hypoglycemia: impaired awareness may be masked by inconsistent monitoring. Insulin affordability crisis: some patients ration insulin after losing parental insurance coverage.
## Long-Term Complications Screening
Eye exams: annual dilated exam starting 5 years after diagnosis or at puberty. Nephropathy: annual urine albumin-to-creatinine ratio. Neuropathy: annual monofilament exam starting 5 years after diagnosis. Cardiovascular risk assessment: lipids, blood pressure. Thyroid function and celiac screening (autoimmune comorbidities) Screening intervals may change during transfer between pediatric and adult guidelines.
A timeline illustration showing the T1DM transition journey from age 12 to 25. The top half shows the pediatric care environment with family involvement, diabetes camp, and school support gradually decreasing. The bottom half shows adult care responsibilities increasing, including self-scheduling, insurance management, and independent decision-making. Key milestones are marked: transition introduction at 14, readiness assessment at 16, transfer at 18-21, and independent care by 25. A1c trajectory line shows a typical dip during the transition gap.
A comparison infographic showing side-by-side columns of pediatric vs. adult T1DM management approaches. The left column (pediatric) shows family-centered visits, school nurse coordination, diabetes camp, frequent multidisciplinary team contact, and growth-adjusted insulin dosing. The right column (adult) shows individual autonomy, workplace accommodations, preconception counseling, cardiovascular risk management, and complication screening. A bridge between the columns shows the Med-Peds physician facilitating the connection.
A medical illustration showing diabetes technology components used in T1DM management: a continuous glucose monitor sensor on the arm with a smartphone displaying glucose trend data, an insulin pump attached at the abdomen with infusion set detail, and a hybrid closed-loop system diagram showing the feedback loop between CGM readings, algorithm, and insulin delivery. Labels indicate key components that patients must learn to self-manage before transition.
## Clinical Pearls
The transition period (ages 18-25) is the highest-risk period for DKA hospitalization and loss to follow-up in T1DM. Time-in-range (>70% between 70-180 mg/dL) is increasingly preferred over A1c as the primary glycemic metric. Always screen for diabetes distress and disordered eating in adolescents and young adults with T1DM. Insulin affordability is a real barrier -- know resources like manufacturer patient assistance programs, state programs, and Walmart ReliOn insulin. Never assume a young adult with T1DM knows their sick day rules; reassess at every transition-related visit. Med-Peds physicians can bridge the gap by providing continuity across the transition period in a single practice. Insurance disruption is predictable -- plan proactively at age 17 and again at age 25. Technology transfers (pump and CGM data) between pediatric and adult practices are often the weakest link in the handoff.
## References
- American Diabetes Association. Standards of Care in Diabetes -- 2024. Diabetes Care. 2024;47(Suppl 1).
- Peters A, Laffel L. Diabetes care for emerging adults: recommendations for transition from pediatric to adult diabetes care systems. Diabetes Care. 2011;34(11):2477-2485.
- Sequeira PA, Pyatak EA, Weigensberg MJ, et al. Let's empower and prepare (LEAP): evaluation of a structured transition program for young adults with type 1 diabetes. Diabetes Care. 2015;38(8):1412-1419.
- Lotstein DS, Seid M, Klingensmith G, et al. Transition from pediatric to adult care for youth diagnosed with type 1 diabetes in adolescence. Pediatrics. 2013;131(4):e1062-e1070.
- Garvey KC, Wolpert HA, Rhodes ET, et al. Health care transition in patients with type 1 diabetes: young adult experiences and relationship to glycemic control. Diabetes Care. 2012;35(8):1716-1722.