AAA Screening Test Guide

What Is an AAA Screening Test and Why Should You Care?

An AAA screening test is a simple ultrasound that checks the size of your abdominal aorta — the largest artery in your body. It runs from your chest down through your belly. When a section of that artery wall weakens and balloons outward, it becomes what doctors call an abdominal aortic aneurysm, or AAA. The screening exists because most people with an AAA feel absolutely nothing. No pain. No symptoms. Nothing at all — until the artery ruptures. And when it does rupture, roughly 80% of people don’t survive.

That single fact is the entire reason this test exists. It catches a silent, life-threatening problem before it becomes an emergency. The test itself takes about 10 to 15 minutes, uses no radiation, requires no needles, and involves zero prep on your part. A technician applies gel to your abdomen, runs an ultrasound wand over it, and measures the diameter of your aorta. That’s it.

If you’re a man between 65 and 75 who has smoked at any point in your life — even if you quit decades ago — the U.S. Preventive Services Task Force (USPSTF) recommends you get this screening at least once. Medicare even covers it as part of the “Welcome to Medicare” preventive visit. Yet a surprising number of people who qualify never get it done. Some don’t know about it. Others assume they’d feel something if something were wrong. That assumption is exactly what makes AAA dangerous.

How the AAA Aorta Screening Actually Works

There’s nothing complicated about the procedure. You lie on your back on an exam table. A sonographer applies a warm gel to your abdomen — same type of ultrasound gel used during pregnancy scans. They press a small handheld probe (called a transducer) against your skin and move it across different areas of your belly. The probe sends sound waves through your body, which bounce off your aorta and create a real-time image on a monitor.

The sonographer measures the diameter of your abdominal aorta at its widest point. A normal aorta is less than 3 centimeters across. If it measures 3 centimeters or more, that’s classified as an aneurysm. The size determines what happens next:

Less than 3 cm: Normal. No follow-up needed in most cases.

3 to 4.4 cm: Small aneurysm. You’ll be rescreened with ultrasound every 12 months to track growth.

4.5 to 5.4 cm: Medium aneurysm. Rescreening every 3 to 6 months. Your doctor will likely start discussing surgical options.

5.5 cm or larger: Large aneurysm. Surgical repair is usually recommended because the risk of rupture increases significantly at this threshold.

The whole AAA aorta screening process is painless. You don’t need to fast. You don’t need to stop taking medications. You walk in, lie down, get scanned, and walk out. Results are typically available the same day or within a few days.

Who Qualifies for Screening for AAA

The guidelines here are specific, and they’re based on decades of population-level research.

The USPSTF gives a B recommendation — meaning there’s high certainty of moderate net benefit — for one-time screening for AAA in men aged 65 to 75 who have ever smoked. “Ever smoked” means anyone who has smoked at least 100 cigarettes in their lifetime. That’s roughly five packs total. If you smoked socially in college for a year and quit, you still qualify.

For men aged 65 to 75 who have never smoked, the USPSTF gives a C recommendation. That means the benefit is small and the decision should be individualized — talk to your doctor about your specific risk factors.

For women who have never smoked and have no family history of AAA, screening is not recommended. The USPSTF gives this a D rating, meaning the potential harms outweigh the benefits in that group. However, women who have smoked or who have a first-degree relative (parent, sibling) with AAA history may still benefit from screening. The data for women is less robust, so the recommendation is less firm.

Here’s a quick look at who should be paying attention:

— Men 65–75 who have ever smoked: Get screened. One time. It’s covered by Medicare.
— Men 65–75 who have never smoked: Talk to your doctor. Consider family history and other vascular risk factors.
— Women 65–75 who have ever smoked: Ask your doctor. Some vascular societies recommend screening in this group.
— Anyone with a first-degree family member who had an AAA: Mention it to your doctor regardless of age or gender.

Why Most People with an AAA Have No Idea

This is the part that trips people up. An abdominal aortic aneurysm doesn’t hurt. It doesn’t cause shortness of breath. It doesn’t make you feel dizzy or tired. In the vast majority of cases, it produces no symptoms whatsoever until it either grows large enough to press on surrounding structures or it ruptures.

A man named Gerald, a 68-year-old retired electrician from Ohio, shared his experience at a community health event in 2025. He had smoked for about 15 years — quit at age 40. Felt perfectly healthy. His primary care doctor mentioned the AAA screening test during a routine checkup. Gerald almost declined. He figured there was no point since he felt fine. He went ahead with it mostly because it was free under Medicare.

His aorta measured 4.2 centimeters. A small aneurysm. Not immediately dangerous, but absolutely something that needed monitoring. Six months later, it had grown to 4.8 centimeters. His vascular surgeon scheduled an endovascular repair — a minimally invasive procedure done through a small incision in the groin. Gerald was home in two days. If he’d skipped that initial screening, that aneurysm would have kept growing in silence.

Gerald’s story isn’t unusual. According to the Society for Vascular Surgery, approximately 200,000 people in the United States are diagnosed with an AAA each year. An estimated 10,000 to 15,000 die annually from ruptured aneurysms. Many of those deaths are preventable with early detection through screening for AAA.

What Happens If an AAA Is Found

Finding an aneurysm doesn’t mean you’re going straight to surgery. The management depends entirely on size and growth rate.

Small Aneurysms (3–4.4 cm)

These are watched. Your doctor will schedule periodic ultrasounds — usually once a year — to check whether the aneurysm is growing. Most small AAAs grow at a rate of about 1 to 3 millimeters per year. Some barely grow at all. During this time, you’ll be advised to stop smoking if you haven’t already, manage blood pressure, and possibly take a statin if your cholesterol is elevated. These measures don’t shrink the aneurysm, but they can slow its growth.

Medium Aneurysms (4.5–5.4 cm)

Monitoring becomes more frequent. Every 3 to 6 months. Your vascular team will weigh the risk of rupture against the risk of surgical intervention. The decision to operate isn’t purely about size — it also factors in growth rate, shape of the aneurysm, your overall health, and whether you’re a good surgical candidate.

Large Aneurysms (5.5 cm or larger)

At this point, the annual rupture risk climbs steeply. For aneurysms between 5.5 and 5.9 cm, the estimated rupture risk is around 9.4% per year. For those 6 cm or larger, it jumps to 10–20% or more annually. Surgical repair is typically recommended.

There are two main surgical approaches:

Open surgical repair: A large incision in the abdomen. The surgeon clamps the aorta above and below the aneurysm, removes the damaged section, and sews in a synthetic graft. This is major surgery. Hospital stay is usually 5 to 7 days. Full recovery takes 2 to 3 months.

Endovascular aneurysm repair (EVAR): A catheter is threaded through a small incision in the groin up to the aneurysm site. A stent graft is deployed inside the aorta to reinforce the weakened wall from within. Hospital stay is typically 1 to 3 days. Recovery is faster. Not everyone is anatomically suited for EVAR — the shape and location of the aneurysm matter.

Both procedures have strong track records. A landmark study — the UK EVAR Trial — found that EVAR had lower 30-day mortality compared to open repair (1.7% vs. 4.7%), though long-term outcomes were similar over the following years. Your vascular surgeon will recommend the best approach based on your anatomy and health.

Common Mistakes People Make About AAA Screening

There are a few patterns that show up repeatedly in conversations about this test.

Assuming You’d Feel Something

This is the most dangerous misconception. AAAs are called “silent killers” for a reason. The aorta sits deep in the abdomen, behind the intestines. An aneurysm can grow for years without pressing on anything you’d notice. By the time it causes back pain or abdominal pain, it may already be close to rupturing — or actively leaking.

Thinking You Don’t Qualify Because You Quit Smoking

The guideline says “ever smoked.” Quitting reduces your cardiovascular risk across the board, but the structural damage to blood vessel walls from past smoking doesn’t fully reverse. If you smoked at any point, you qualify for the AAA screening test at age 65.

Skipping It Because You Already Had a Physical

A standard annual physical does not include an aortic ultrasound. Your doctor listens to your heart, checks your blood pressure, maybe orders blood work. None of that detects an AAA. The screening is a separate test that has to be specifically ordered or requested.

Waiting Until You’re “Older”

The screening is recommended starting at 65 for a reason. AAA prevalence increases with age, and 65 is the point where the risk-benefit ratio clearly favors screening in at-risk groups. Waiting until 75 or 80 means the aneurysm may have grown to a dangerous size — or ruptured — in the intervening years. If you’re eligible now, get it done now.

Not Mentioning Family History

If your father, mother, brother, or sister had an AAA, your risk is significantly higher. Some studies estimate a 2- to 4-fold increase in risk with a positive family history. Current guidelines from the Society for Vascular Surgery suggest screening at age 55 or older for people with a family history of AAA, regardless of smoking status. Tell your doctor. They can’t act on information they don’t have.

The Numbers Behind the Screening

The evidence supporting one-time AAA screening in at-risk men is solid. Here are some specific figures worth knowing.

The Multicentre Aneurysm Screening Study (MASS), conducted in the UK and published in The Lancet, followed over 67,000 men aged 65 to 74. Men who were invited to screening had a 42% reduction in AAA-related mortality over a 13-year follow-up period compared to men who were not screened.

A Swedish trial — the Viborg County Screening Trial — found similar results. AAA-related mortality dropped by approximately 67% in the screened group over 5 years. These are not marginal differences. Screening genuinely saves lives in this population.

The cost-effectiveness has also been studied extensively. A 2026 review published in the Journal of Vascular Surgery estimated the cost per quality-adjusted life year (QALY) gained through one-time screening in men 65–75 who have smoked at approximately $11,000 to $22,000 — well within the threshold typically considered cost-effective in the United States ($50,000 to $100,000 per QALY).

Prevalence-wise, AAA is found in about 1.3% to 5% of men aged 65 to 75 who have smoked, depending on the study and population. That means for every 100 men screened, roughly 1 to 5 will have an aneurysm detected. It sounds low until you remember what happens when one of those aneurysms ruptures undetected.

What the AAA Screening Test Does Not Do

It’s worth being clear about the limitations so you have realistic expectations.

The test only evaluates the abdominal aorta. It does not check the thoracic aorta (the section in your chest). It does not screen for other vascular problems like peripheral artery disease or carotid artery stenosis. It’s not a general cardiovascular checkup.

It also only captures a snapshot in time. A normal result at age 65 means your aorta was normal that day. While it’s unlikely that a normal aorta would develop a significant aneurysm in the years immediately following a normal screen, it’s not impossible — especially if strong risk factors persist. The USPSTF considers one-time screening sufficient for most people, but your doctor may recommend follow-up if your risk profile changes.

False positives are rare with ultrasound for AAA — the test is highly accurate with a sensitivity above 95% and specificity above 99% in experienced hands. But measurement variability can occur. An aorta measured at 2.9 cm on one scan and 3.1 cm on another doesn’t necessarily mean it’s grown. Small differences can come down to the angle of the probe or the technician’s measurement point. If a borderline result is found, a repeat scan can clarify.

How to Get Screened

If you’re eligible, here’s the practical path.

Through your primary care doctor: Mention the AAA screening test at your next appointment. If you’re a man aged 65–75 who has ever smoked, your doctor can order the ultrasound. Many will bring it up proactively, but not all do — especially in busy practices.

Through Medicare’s Welcome to Medicare visit: If you’re newly enrolled in Medicare Part B, you have a one-time preventive visit within the first 12 months of enrollment. The AAA ultrasound is covered during this visit at no cost to you. After that window, getting it covered can be trickier, so don’t delay.

Through community screening events: Organizations like Life Line Screening and some local hospitals offer AAA ultrasound screenings at community events, churches, and health fairs. These typically cost between $60 and $150 out of pocket if you’re paying without insurance. The quality varies, so check that the screening is performed by a credentialed sonographer.

Through your vascular specialist: If you already see a vascular surgeon for another condition — varicose veins, peripheral artery disease, carotid disease — they can order or perform the screening directly.

Risk Factors Beyond Smoking

Smoking history is the single strongest modifiable risk factor for AAA. But it’s not the only one. Here’s what else increases risk:

Age: Risk increases with age. AAA is rare before age 55 and becomes progressively more common after 65.

Sex: Men are 4 to 6 times more likely to develop an AAA than women. However, when women do develop one, they tend to rupture at smaller diameters — which is why some experts argue current size thresholds for intervention may need to be lower for women.

Family history: A first-degree relative with AAA increases your risk 2- to 4-fold.

High blood pressure: Chronic hypertension puts ongoing stress on arterial walls, accelerating degeneration.

Atherosclerosis: Plaque buildup in arteries is associated with aneurysm formation. The mechanisms overlap but aren’t identical.

Connective tissue disorders: Conditions like Marfan syndrome and Ehlers-Danlos syndrome weaken the structural proteins in blood vessel walls, dramatically increasing aneurysm risk — sometimes at much younger ages.

Chronic obstructive pulmonary disease (COPD): COPD is independently associated with AAA, likely because of shared inflammatory pathways and the strong link to smoking.

Living with a Known AAA

If screening reveals an aneurysm that doesn’t yet need surgery, you’re in a monitoring phase. This can feel unsettling — knowing something is there but not acting on it immediately.

Here’s what the monitoring phase typically looks like. You’ll have regular ultrasounds on a schedule your doctor sets based on the aneurysm’s size. You’ll be encouraged to quit smoking if you haven’t. Blood pressure management becomes a priority — most doctors aim for a target below 130/80 mmHg. Statin therapy may be recommended. Moderate physical activity is generally encouraged, but heavy weightlifting and intense straining (Valsalva maneuvers) are often discouraged because they transiently spike blood pressure.

Some patients describe the psychological weight of knowing they have an aneurysm as harder than any physical symptom. Support groups — both online and in person — exist for people living with AAA. The Aortic Disease Foundation and the Society for Vascular Surgery both maintain patient resources.

Frequently Asked Questions About the AAA Screening Test

Is the AAA screening test painful?

No. It’s an external ultrasound. The probe is pressed against your abdomen with gel. There are no needles, no incisions, and no radiation. Most people describe it as completely painless.

How long does the screening take?

About 10 to 15 minutes from start to finish. You can eat, drink, and take medications normally beforehand.

Does insurance cover the AAA screening test?

Medicare covers a one-time AAA screening for eligible beneficiaries during the Welcome to Medicare preventive visit. Private insurance coverage varies — check with your plan. Many cover it when ordered by a physician for an at-risk patient.

Can women get screened for AAA?

The USPSTF does not broadly recommend screening for women who have never smoked. However, women who have smoked or who have a family history of AAA may benefit from screening. Discuss your individual risk with your doctor.

What if my screening result is normal?

A normal result means your aorta measured less than 3 cm at the time of the test. In most cases, no repeat screening is needed. The one-time test is considered sufficient for the general at-risk population.

At what size does an AAA need surgery?

Most vascular surgeons recommend repair when an AAA reaches 5.5 cm in men or 5.0 cm in women, or when the aneurysm is growing faster than 0.5 cm over six months. Individual factors always play a role in the decision.

Take the Next Step

The AAA screening test is one of the simplest, fastest, and most effective preventive tests available. If you’re in the at-risk group — male, 65 to 75, history of smoking — there’s no defensible reason to skip it. The test takes minutes. The potential consequence of not getting it is death from a ruptured aneurysm that could have been caught and managed years earlier.

Talk to your doctor at your next visit. Mention the screening by name. If you’ve already been screened and your result was normal, you’re in good shape. If an aneurysm was found, stay on top of your monitoring schedule and follow your vascular team’s guidance.

Read the rest of our articles and more useful info down below for additional guidance on vascular health, preventive screenings, and making informed decisions about your care.