<h3>Background</h3> Abnormal uterine bleeding (AUB) is commonly experienced by adolescents and young adults (AYA) following contraceptive implant placement. We assessed for predictors of AUB, factors contributing to AUB management, and differences in implant continuation rates by AUB management approach. <h3>Methods</h3> We analyzed data from a long-acting reversible contraception database from 3 AYA sites in tertiary care institutions. We included patients with the contraceptive implant placed from 7/1/2014-12/31/2018 and follow-up data through 12/31/2019. We excluded patients with ≥3 years since insertion without follow-up. Variables included age at insertion, comorbid conditions, menstrual history, prior contraceptive use, patient-reported AUB after implant placement, AUB evaluation and management, and implant discontinuation. We included data from insertion, follow-up, and removal visits. We assessed AUB predictors with logistic regression. Descriptive statistics, chi-square, and t-tests compared patient demographic and clinical variables by AUB status. Survival analysis examined predictors of time to discontinuation. This study was IRB approved. <h3>Results</h3> Our sample included 609 patients, average age was 19 years (SD=2.5). Prior to implant placement 37% reported irregular menses, and after insertion 25% reported AUB. In those with AUB, 67% had evaluation and management including laboratory studies (32%), pelvic ultrasound (4%), or medication therapy (86%). Medication initiation occurred at first AUB report for the majority of patients. Of those prescribed a medication, 60% received a combined oral contraceptive or progestin-only pill. AUB was associated with polycystic ovary syndrome (PCOS) in bivariate analysis (p-value=0.006), 57% of patients with PCOS (n=14) reported AUB after implant insertion. This association persisted after adjusting for age, medical comorbidities, menstrual history, and prior contraceptive use. Bivariate analyses did not identify any predictors for AUB evaluation and management. Implant discontinuation was low: 16% at 1 year, 27% at 2 years, and 35% at 3 years. Early discontinuation was significantly different between patients with and without AUB: 21% vs. 14% at 1 year (p-value=0.047), 38% vs. 23% at 2 years (p-value=0.000), 44% vs. 31% at 3 years (p-value=0.007). Medication for AUB management did not impact rates of or time to early discontinuation. <h3>Conclusions</h3> In this large cohort of AYA, PCOS was the only significant predictor of implant-associated AUB. There were no relationships between AUB and comorbid medical conditions or prior contraceptive use. There were no significant predictors of AUB evaluation and management following implant insertion, and such evaluation and management did not impact rates of early discontinuation.