The last time ACOG released a practice bulletin on the prevention of preterm birth was in 2012. In August 2021, the ACOG will release a new practice bulletin addressing prediction and prevention of preterm birth. In this session, we will summarize transvaginal ultrasound for cervical length screening. Is there a “reassuring“ cervical length using TRANSABDOMINAL ultrasound? When should these be done? And what about all the new progesterone data? Listen to find out.