Clinical Research Directory

Retrospective Phase Inclusion criteria: * Patients with delivery in NorthShore University HealthSystem, * Ultrasound available within 4 weeks of delivery with adequate placental images * Placental pathology available Exclusion criteria: * Multiple gestation Prospective Phase Inclusion criteria * Exposed: Patients with singleton gestation with fetal growth restriction at 20-28 weeks with a plan to deliver at NorthShore Highland Park Hospital Evanston Hospital. Patients must have a first-trimester ultrasound (\<14 weeks) to confirm pregnancy dating available in the electronic medical record. * Unexposed: Patients who present for routine ultrasound evaluation at 36-38 weeks with normal fetal growth with a plan to deliver at NorthShore Highland Park Hospital or NorthShore Evanston Hospital. Exclusion criteria: * Exposed: Multiple gestation, major fetal anomaly * Unexposed: Multiple gestation, history of chronic hypertension, gestational or pregestational diabetes, major fetal anomaly antiphospholipid syndrome, known thrombophilia