Tags: Disease.
Occasionally there is only the one single umbilical artery (SUA) present in the umbilical cord. Approximately this affects between 1 in 100 and 1 in 500 pregnancies making it the most common umbilical abnormality. It is more common in multiple births. Its cause is not known.Most cords have one vein and two arteries. The vein carries oxygenated blood from the placenta to the baby and the arteries carry deoxygenated blood from the baby to the placenta.
