(Abstracted from J Ultrasound Med 2018;37:2011–2019)Placenta previa or low-lying placenta is identified on a significant number of midtrimester ultrasounds (USs), and the large majority of these resolve by term. While guidelines recommend follow-up US at 32 weeksʼ gestation to assess for resolution of midtrimester previa, limited data exist to support this recommendation.