Colbey Ricklefs, MD, MPH
Assistant Professor
Pediatrics
School of Medicine

Education & Training

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• Adolescent and Young Adult Medicine University of California, San Francisco 07/2026
• Family Medicine University of Washington 07/2023

Publications (14)

Top publication keywords:
Marijuana UseSexual and Gender MinoritiesTransgender PersonsPrimary Health CareForms and Records ControlPre-Exposure ProphylaxisSleepSleep Wake DisordersLegislation, DrugMarijuana SmokingAdolescent DevelopmentCognitionGender IdentitySocial MediaAdolescent Behavior

• Co-use of Some Substances Associated With Higher Doses in Adolescents: Findings From the Adolescent Brain Cognitive Development Study.
  The Journal of adolescent health : official publication of the Society for Adolescent Medicine 2026 Ricklefs C, Kim KE, Thompson A, Santos GM, Brindis CD, Ganson KT, Testa A, Piatkowski TM, Nagata JM
• A Decade of Improvement and Signs of Decline in PrEP Awareness and Use in Young Trans Women.
  AIDS and behavior 2026 Ricklefs C, Suprasert B, McFarland W, Wilson EC
• Cannabis legalization and early adolescent expectancies: Findings from the adolescent brain cognitive development study.
  Drug and alcohol dependence 2026 Ricklefs C, Santos GM, Brindis CD, Baker FC, Nagata JM
• Social media use, smoking expectancies, and nicotine experimentation in early adolescents: A prospective cohort study.
  The American journal on addictions 2026 Nagata JM, Caffrey A, Heuer A, Murillo KB, Helmer CK, Frimpong I, Ricklefs C, Al-Shoaibi AA, Testa A, Brindis CD, Santos GM, Baker FC
• Social epidemiology of multidimensional sleep health in early adolescence.
  Pediatric research 2025 Nagata JM, Helmer CK, Frimpong I, Beltran Murillo K, Heuer AW, Huang OH, Li EJ, Ricklefs C, Ganson KT, Testa A, He J, Baker FC

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• Cannabis expectancies mediate the association between social media use and cannabis experimentation in early adolescents: A prospective cohort study.
  Drug and alcohol dependence 2025 Nagata JM, Caffrey A, Nguyen ND, Nayak S, Frimpong I, Helmer CK, Ricklefs C, Al-Shoaibi AA, Testa A, Brindis CD, Santos GM, Baker FC
• Cyberbullying and Sleep Disturbances in Adolescents: An Updated Evidence Review.
  Academic pediatrics 2025 Nagata JM, Li EJ, Huang OH, Ricklefs C, Ganson KT, Testa A, Scheffler A, Sugrue L, Baker FC
• Changes in Diversity, Equity, and Inclusion Activities of Family Medicine Departments.
  Family medicine 2024 Lindley AR, Ricklefs C, Kost A, Patterson DG, Evans DV, Sturges D, Bennett IM, Cawse-Lucas J
• Gender Identity Disparities in Early Adolescent Sleep: Findings from the Adolescent Brain Cognitive Development Study.
  LGBT health 2024 Ricklefs C, Balasubramanian P, Ganson KT, Testa A, Kiss O, Baker FC, Nagata JM
• Healthcare for Sexual and Gender Minority Adolescents.
  Primary care 2024 Ho T, Ricklefs C
• Training Among Noncustodial Health Care Workers Caring for Patients Experiencing Incarceration: A Preliminary Investigation.
  Journal of correctional health care : the official journal of the National Commission on Correctional Health Care 2023 Barnett H, Taylor Z, Booker L, Ricklefs C, Veltri K, Ervin DV, Gimarc K, Adedipe A
• Barriers Pediatric PCP's Identify To Providing Gender-Affirming Care For Adolescents.
  The Journal of adolescent health : official publication of the Society for Adolescent Medicine 2023 Sequeira GM, Kahn NF, Ricklefs C, Collin A, Asante PG, Pratt W, Christakis D, Richardson LP
• PrEP'aring for Impact: Implicit Bias and Imperfect Billing Codes.
  Family medicine 2023 Ricklefs C
• Implementation of App-Based Diabetes Medication Management: Outpatient and Perioperative Clinical Decision Support.
  Current diabetes reports 2021 Jang J, Colletti AA, Ricklefs C, Snyder HJ, Kardonsky K, Duggan EW, Umpierrez GE, O'Reilly-Shah VN