Who this is for
Both bodies build their advice from the same four risk factors: older age, male sex, smoking and a first-degree relative with an aneurysm. Neither treats them as equal. Smoking and male sex do most of the work, and "ever smoked" is normally defined as 100 or more cigarettes in a lifetime.
Where they part company is women, and family history. Read the rows below before you assume this does not apply to you.
None of this is about symptoms. Sudden severe abdominal or back pain with faintness is an emergency, not a screening question.
Where the recommendations diverge
- USPSTF 65 to 75
- USPSTF 65 to 75
- USPSTF Evidence insufficient 65 to 75
- USPSTF Recommends against
- ACC / AHA 65 and older
- ACC / AHA 65 and older
- ACC / AHA 65 and older
The USPSTF recommends 1-time screening for abdominal aortic aneurysm (AAA) with ultrasonography in men aged 65 to 75 years who have ever smoked.
Our note: Interval taken from the same page's clinician summary, which answers "How often?" with "One-time screening". The statement says it is consistent with the 2014 USPSTF recommendation, with family history newly added as a risk factor in the decision for women.
The USPSTF recommends that clinicians selectively offer screening for AAA with ultrasonography in men aged 65 to 75 years who have never smoked rather than routinely screening all men in this group. Evidence indicates that the net benefit of screening all men in this group is small.
Our note: A grade C is not a recommendation against. The statement continues: "In determining whether this service is appropriate in individual cases, patients and clinicians should consider the balance of benefits and harms on the basis of evidence relevant to the patient's medical history, family history, other risk factors, and personal values."
The USPSTF concludes that the current evidence is insufficient to assess the balance of benefits and harms of screening for AAA with ultrasonography in women aged 65 to 75 years who have ever smoked or have a family history of AAA.
Our note: An I statement means unresolved, not unhelpful. The reason IS published on the same page, in the section defining scope: "the randomized trial evidence focuses almost entirely on men aged 65 to 75 years." The evidence table adds: "There is inadequate evidence to conclude whether 1-time screening for AAA with ultrasonography is beneficial in women aged 65 to 75 y who have ever smoked or have a family history of AAA".
The USPSTF recommends against routine screening for AAA with ultrasonography in women who have never smoked and have no family history of AAA.
Our note: This row is left with no age bounds because the recommendation states none: its population heading on the page is "Women who have never smoked", with no age band, unlike the three rows above it. The stated basis: "There is moderate certainty that the harms of screening for AAA with ultrasonography in women who have never smoked and have no family history outweigh the benefits."
In men who are ≥65 years of age who have ever smoked, ultrasound screening for detection of AAA is recommended.
Our note: From the 2022 ACC/AHA aortic disease guideline, Section 6.2. Class of Recommendation 1, Level of Evidence B-R. No upper age is stated, so stop_age is left empty rather than borrowing USPSTF's 75. The guideline's own note on older patients: "two-thirds of the acute AAA events occurred in those ≥75 years of age; consequently, screening to elderly patients should be offered, provided they would benefit from potential aortic repair."
In men or women who are ≥65 years of age and who are first-degree relatives of patients with AAA, ultrasound screening for detection of AAA is recommended.
Our note: Class of Recommendation 1, Level of Evidence C-LD. The guideline's stated basis: small cohort studies of ultrasound screening in relatives "identified an overall prevalence of new AAA of 10% to 20%, with the highest prevalence of 25% found among brothers." USPSTF makes no recommendation on family history alone in men, and treats it in women only inside its I statement.
In women who are ≥65 years of age who have ever smoked, ultrasound screening for detection of AAA is reasonable.
Our note: Class of Recommendation 2a, Level of Evidence C-EO (expert opinion). This is the row that contradicts USPSTF's I statement, and the guideline states its reasoning: "the risk of AAA may be potentiated by smoking in women; in 1 study, smoking was associated with a 15-fold increased risk of AAA among women (relative risk, 15.0; 95% CI, 13.2-17.0) versus 7-fold among men." It also concedes: "Practical implementation and outcomes of screening in women remain uncertain and warrant further study."
Why they differ
For a man in his late sixties who used to smoke, both bodies say the same thing: one ultrasound. Everywhere else they diverge, and the sharpest divergence is about women.
- USPSTF (2019) gives women aged 65 to 75 who ever smoked or have a family history an I statement: the evidence is insufficient to say. Its published reason is an evidence gap, stated plainly on its own page: "the randomized trial evidence focuses almost entirely on men aged 65 to 75 years." Four large trials of one-time screening, 134,271 people, predominantly men.
- ACC/AHA (2022) calls screening those same women reasonable (Class 2a), and is explicit that this rests on expert opinion rather than trial data (Level of Evidence C-EO). Its reason is a risk argument rather than a trial result: smoking raises AAA risk about fifteen-fold in women against roughly seven-fold in men.
Both are reading the same absence of trials and drawing opposite operating conclusions from it. USPSTF's rule is that without evidence it will not tell a clinician what to do. ACC/AHA's is that a fifteen-fold risk multiplier justifies acting anyway. Neither is hiding anything: ACC/AHA prints its own caveat that outcomes of screening in women "remain uncertain and warrant further study."
Two more differences worth knowing. Family history: ACC/AHA gives its strongest recommendation, Class 1, to any man or woman 65 or older with a first-degree relative who had an AAA. USPSTF has no equivalent row. The upper edge: USPSTF bounds every recommendation at 75, while ACC/AHA writes "65 years of age or older" with no ceiling and argues that most ruptures happen after 75.
The scheme also changed on the ACC/AHA side, which matters if you are reading older summaries. USPSTF's own 2019 page describes the then-current ACC/AHA position as recommending against screening "in men who have never smoked or in women." The 2022 aortic guideline reversed that for women who smoked. Anything written before November 2022 describing ACC/AHA as not screening women is out of date.
2 documents set the numbers on this page. The oldest was published in 2019, the newest in 2022.
We last re-read these sources on . How we verify.
What the test involves
Abdominal duplex ultrasonography, which USPSTF calls the standard approach. A technician moves a probe across the abdomen with gel; the machine measures the widest diameter of the aorta. It takes minutes, uses no radiation and needs no needle. Some clinics ask you not to eat beforehand so that bowel gas does not obscure the view.
An aorta under 3 cm is a normal result. Both bodies treat one clear scan as decisive for most people: ACC/AHA states that in asymptomatic men or women over 75 with a negative initial ultrasound, repeat screening is not recommended.
If the result is abnormal
An aneurysm found by screening is usually small, and small aneurysms are watched rather than repaired. The interval between scans is set by the diameter. Repair, whether open or by stent graft, is offered when the aneurysm reaches a size where the risk of rupture outweighs the risk of the operation, or when it is growing fast.
This is also the point where screening stops being a good idea for some people. USPSTF frames the whole thing as a decision about treatment as much as detection: if surgery would not be an option for you, finding an aneurysm buys anxiety rather than time.
More on this screening
Frequently asked questions
I am a woman in my sixties who used to smoke. Should I be screened?
The two bodies genuinely disagree, so there is no single answer to give you. USPSTF says the evidence is insufficient to recommend for or against. ACC/AHA says screening is reasonable, on expert opinion rather than trial data. A clinician who offers you the scan and one who does not are each following a current US guideline. Ask which one they are using.
My father had an aortic aneurysm. Does that change anything?
Under ACC/AHA, yes and strongly: any man or woman 65 or older with a first-degree relative who had an AAA gets its Class 1 recommendation for ultrasound screening, smoking history or not. Under USPSTF, family history appears only inside the I statement for women, and there is no separate row for men with a family history. If you are under 65 with several risk factors or a first-degree relative, ACC/AHA says screening may be considered.
Is one scan really enough?
For most people with a normal result, yes. USPSTF specifies one-time screening. ACC/AHA goes further and gives a Class 3 (no benefit) recommendation against repeat screening in asymptomatic men or women over 75 who had a negative initial ultrasound.
Does an aneurysm found on screening mean surgery?
Usually not, at least not soon. Most screen-detected aneurysms are small and enter a surveillance program of periodic ultrasounds. Repair is offered on size and growth rate, weighed against the risk of the operation itself.