Single umbilical artery HP:0001195 Single umbilical artery (SUA) is the absence of one of the two umbilical arteries surrounding the fetal bladder and in the fetal umbilical cord. 2 vessel cord Only one artery in umbilical cord instead of two SUA SNOMEDCT_US:204470001 Two vessel umbilical cord Two vessel cord 2 vessel umbilical cord The umbilical cord normally has two arteries and one vein. UMLS:C1384670 Two-vessel cord Abnormal fetal cardiovascular morphology Abnormal umbilical cord blood vessel morphology Fetal ultrasound soft marker