How to screen for vasa previa.

Risk factors for vasa previa include: IVF pregnancy, velamentous or marginal cord insertion into the placenta, resolving placenta previa, bilobed or succenturiate lobes of the placenta and third-trimester bleeding8. Keywords: placental abnormality; prenatal diagnosis; ultrasound screening; ultrasound technique; umbilical cord abnormality; vasa previa EN placental abnormality prenatal diagnosis ultrasound screening ultrasound technique umbilical cord abnormality vasa previa 720 725 6 05/05/21 20210501 NES 210501 How to....Practical advice on imaging-based techniques and investigations with accompanying slides and videoclips online Background "Vasa previa" refers to a condition in which unprotected fetal vessels traverse the fetal membranes in the lower uterine segment or over the cervix. There are three steps necessary in screening for vasa previa: Evaluate the umbilical cord insertion site into the placenta, to ensure that the cord enters the placenta directly. Practical points Identify placental cord insertion site into the placenta in every pregnancy The most common ultrasound finding in cases of vasa previa is a velamentous or marginal cord insertion into the placenta. [Extracted from the article]