Recommended Ultrasound Surveillance for Patients with Abdominal Aortic Aneurysm
Diameter of aneurysm Interval for follow-up
Less than 3 cm No further testing
3 to 4 cm Every 12 months
4 to 4.5 cm Every six months
Greater than 4.5 cm Consider referral to vascular subspecialist

AAFP.org, Abdominal Aortic Aneurysm (AAA): What You Should Know NHIC website
http://www.medicarenhic.com/news/provider_news/mbr_mar07.pdf
http://www.cms.hhs.gov/MLNMattersArticles/downloads/MM3638.pdf
http://intermountainhealthcare.org/services/heart/symptomsconditions/Pages/AorticAneurysm.aspx
http://www.medicinenet.com/abdominal_aortic_aneurysm/article.htm
http://www.webmd.com/heart-disease/tc/aortic-aneurysm-overview
http://www.aafp.org/afpsort.xml