Midpregnancy Placental Growth Factor Screening and Early Preterm Birth.

Importance: Early preterm birth (ie, at less than 34 weeks' gestation) confers a high risk for adverse health outcomes, yet no universal screening strategy exists, preventing targeted delivery of effective interventions.

Objective: To evaluate the ability of midpregnancy placental growth factor (PlGF) screening to identify pregnancies at highest risk for early preterm birth.

Design, Setting, And Participants: This prospective cohort study was conducted at an urban, tertiary care center from 2020 to 2023.