The abdominal ultrasonography surveillance intervals for abdominal aortic aneurysm depend on the size of the aneurysm:
a) Every 6 months for aneurysms measuring 3.0-3.9 cm in diameter
b) Every 3-6 months for aneurysms measuring 4.0-4.9 cm in diameter
c) Every 6-12 months for aneurysms measuring 5.0-5.4 cm in diameter
d) Every 6-12 months for aneurysms measuring ≥ 5.5 cm in diameter