I am at 4.5 cm, AAA was identified 3 years ago at 4.0. From my experience and ones of others in this forum and without going into long details you should try to be referred to a thoracic surgeon who actually does these operations. They are normally affiliated with major hospitals which have the resources to do this kind of surgery if needed and give the right kind of advice on how to avoid a problem in the meantime. In my case they require a CT scan each year and some times also an eco. They consider surgery at 5.0 cm. the rate of increase apparently might require surgery earlier. But again best that you connect with the right specialist who will guide you on best way forward. Lots of good info in this forum.