Abdominal aortic aneurysm screening
Recommendations
USPSTF2019Grade B/C/D/I
One-time ultrasound screening in men 65-75 who have ever smoked (B). Selectively offer to men 65-75 who have never smoked, weighing medical history, family history, and other risk factors (C). Women who have never smoked and have no family history of AAA: do not screen (D). Women 65-75 who have ever smoked or have a family history of AAA: evidence insufficient (I).
Verify at USPSTF (opens in a new tab)ACC/AHA2022Grade Class 1 / 2a
Ultrasound screening is recommended for men ≥65 who have ever smoked (Class 1, LOE B-R) and for men or women ≥65 with a first-degree relative with AAA (Class 1, C-LD); reasonable for women ≥65 who have ever smoked (2a). May be considered under 65 with multiple risk factors or a first-degree relative (2b). After a negative initial screen, do not rescreen asymptomatic adults over 75 (Class 3: No Benefit).
Verify at ACC/AHA (opens in a new tab)ACC/AHA2022Grade Class 1
Surveillance of a known AAA: ultrasound every 3 years for 3.0-3.9 cm; annually for 4.0-4.9 cm in men or 4.0-4.4 cm in women; every 6 months for ≥5.0 cm in men or ≥4.5 cm in women (LOE B-NR). Refer for repair at ≥5.5 cm in men or ≥5.0 cm in women (LOE A), or if symptoms are attributable to the aneurysm. Moderate- or high-intensity statin if there is aortic atherosclerosis.
Verify at ACC/AHA (opens in a new tab)Who this applies to
- Men 65 to 75 who have ever smoked (100 cigarettes or more in a lifetime): one-time abdominal ultrasound (USPSTF 2019, Grade B).
- Men 65 to 75 who never smoked: selectively offer, weighing family history, other risk factors and preferences (Grade C).
- Women who never smoked and have no family history: do not screen (Grade D). Women 65 to 75 who smoked or have a family history: insufficient evidence (I). The ACC and AHA (2022) go further: screening is recommended for anyone 65 or older with a first-degree relative with an aneurysm and is reasonable for women 65 or older who have ever smoked.
How it is done in practice
- Abdominal ultrasound. An infrarenal aorta 3.0 cm or wider is an aneurysm. Medicare covers a one-time screen, with a clinician referral, for men 65 to 75 who have smoked 100 or more cigarettes and for anyone with a family history.
- Surveillance intervals (ACC and AHA 2022): 3.0 to 3.9 cm every 3 years; 4.0 to 4.9 cm in men or 4.0 to 4.4 cm in women every 12 months; 5.0 cm or more in men or 4.5 cm or more in women every 6 months.
- Refer for repair discussion at 5.5 cm in men, 5.0 cm in women, growth of 0.5 cm or more in 6 months, or symptoms attributable to the aneurysm (ACC and AHA 2022).
- A normal scan at 65 to 75 does not need repeating.
What changed recently
The 2019 statement kept the 2014 grades, added family history to the statements for women, and called for more evidence in women. The USPSTF rules have not moved since, but the ACC and AHA 2022 aortic guideline is broader, uses sex-specific surveillance and repair thresholds, and advises against rescreening after a negative scan past 75.
Points that matter in clinic
- A first-degree relative with an aneurysm roughly doubles risk. Ask every man at 65, and every patient with a family history regardless of sex.
- These patients carry high cardiovascular risk overall: statins, blood pressure control and smoking cessation matter more to their survival than the aneurysm does at small sizes.
- The FDA warns against fluoroquinolones in people with a known aneurysm because of aortic rupture and dissection reports. Beta-blockers do not slow growth.