RecruitingDrug trialPredicting and Preventing Adverse Maternal and Child Outcomes of Opioid Use Disorder in PregnancyThis study will be a 12-month prospective, genotype-blinded longitudinal observational study with current standard of clinical care. This study will enroll 100 pregnant women with OUD at UPMC Hospitals with its high volumes. Because of the observational nature of the study, the anticipated dropout rate will be ≤ 20%. Investigators expect the effective sample size of evaluable patients will be 200 with longitudinal data.