AAA Screening for Nurse Practitioners | Primary Care Guide

Abdominal aortic aneurysms are usually silent until they rupture, and a rupture is almost always catastrophic. The upside is that one ultrasound at the right time can catch it early. As primary care providers, we're in the best spot to do that.

Who should be screened

• Men age 65 to 75 who have ever smoked: a one-time abdominal ultrasound is recommended.
• Men age 65 to 75 who have never smoked: consider screening case by case, especially with a family history of AAA.
• Women: routine screening is not recommended. Only consider it if the patient is high risk (family history, smoker, vascular disease).

Why it matters

• AAA rupture has a mortality rate of around 80%.
• A quick, noninvasive abdominal ultrasound is highly sensitive and is the gold standard for screening.
• Early detection lets you set up surveillance or refer to vascular surgery before the aneurysm grows to a dangerous size.

What to do with the result

• Under 3.0 cm: no aneurysm, no further follow-up.
• 3.0 to 3.9 cm: small aneurysm. Repeat ultrasound every 2 to 3 years.
• 4.0 to 5.4 cm: medium aneurysm. Monitor every 6 to 12 months.
• 5.5 cm or larger, or rapidly expanding: surgical referral.

Clinical pearls

• Ask about family history. First-degree relatives of patients with AAA are at increased risk.
• Always document smoking history. It's the strongest modifiable risk factor.
• Many patients don't realize screening is covered as a preventive service under Medicare for eligible men.
• Watch for incidental findings. AAAs are sometimes spotted on imaging ordered for other reasons.

Frequently asked questions

Do I screen women for AAA?
Not routinely. Only consider it for a high-risk woman, such as a smoker with a family history or known vascular disease.

The ultrasound shows a 3.5 cm aorta. What now?
That's a small aneurysm. Set up surveillance with a repeat ultrasound every 2 to 3 years and document the size so the next provider has a baseline.

When does it go to vascular surgery?
Refer at 5.5 cm or larger, or if the aneurysm is expanding rapidly.

AAA screening is quick, noninvasive, and genuinely life-saving. For an eligible man, one ultrasound can be the difference between prevention and an emergency. It fits with the other adult prevention workflows like colorectal cancer screening. If you want these size cutoffs on one page in clinic, the Clinical Desk Reference ($37 quick-reference) keeps them close.

Education only. Use clinical judgment and your local guidelines.

Written by Allison Sowders, MSN, APRN, FNP-BC, a practicing primary care nurse practitioner and founder of Nurse Practitioner Mentor. Reviewed July 2026.