Factors Associated With Transitions to Adult Care Among Adolescents and Young Adults With Medical Complexity.

: Thanks to advances in healthcare and technology, adolescents with medical complexity (AMC) and life-threatening conditions are living longer lives and may be expected to transition to adult health care. Yet, current systems and policies of transition care may not reflect their needs, those of their family, or the impact of social determinants of health. The goal of this study was to describe the relationship between social determinants of health and high-quality transition care. : Retrospective cohort study of the 2019-2020 National Survey of Children's Health. The main outcome variable was any support for transition to adult health care. Independent variables were based on a social determinants of health framework. Weighted logistic regression was used to evaluate the association between social determinants and any support for transition to adult health care. : Final weighted sample included 444,915 AMC. AMC were distributed across income levels, most commonly lived in the South, and in supportive, resilient communities. More than 50% experienced adverse childhood events and less than 50% had adequate insurance. Less than one third received any transition support from providers; those who did reported time alone with the provider or active management. Social determinants related to missed days of school, community support/family context, and poverty were associated with both receipt and absence of transition care. : AMC and their families navigate complex environments and associated stressors. Social determinants of health, particularly economic, community/social, and healthcare exert significant and nuanced influence. Such impacts should be incorporated into transition care.