Yolk Sac on Transabdominal Pelvic Ultrasound The yolk sac is the earliest definitive sign of an intrauterine pregnancy on POCUS (when seen within a uterine gestational sac with >7mm of endomyometrial mantle). Appears at 5-6 weeks gestation, provides nutrition until ~12wks when placenta takes over Dr. Meghan Herbst @EUSmkh #Yolk #Sac #Transabdominal #Pelvic #Ultrasound #clinical #obstetrics #obgyn #anatomy #labeled
