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Tests & diagnostics

AAA screening explained

Abdominal aortic aneurysm screening for men - the NHS one-off scan at 65, who should consider testing earlier, and what results mean.

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At a glance

  • Preparation

    No fasting or other preparation is needed for the screening ultrasound itself.

  • What happens during the test

    A quick abdominal ultrasound measures the width of the aorta - the scan takes five to ten minutes and is completely painless.

  • Results timeline

    The measurement is available immediately; private scans include a written report within days.

  • Specialist follow-up

    Normal aortas need no further testing; small aneurysms enter ultrasound surveillance, and large ones are referred to vascular surgery for planned repair.

What this test is and when it is recommended

An abdominal aortic aneurysm is a silent ballooning of the body’s main artery, most common in men over 65, especially smokers and those with a family history. Rupture is usually fatal, but planned repair of a large aneurysm found by screening is very safe by comparison - which is why the NHS invites all men for a one-off ultrasound at 65. Men under 65 with an affected parent or sibling, and those who missed their invitation, are the natural candidates for a private scan.

How to access it

Men outside the NHS programme can book a self-pay aortic ultrasound directly, no GP referral required. NHS waiting lists for diagnostics are often long, while private appointments are typically available within days to around two weeks. Costs vary by provider.

Frequently asked

Common questions about AAA screening explained.

Quick, plain-English answers to what people ask us most.

  • What is AAA screening explained?

    AAA screening explained is a proactive check offered to people who may be at risk of a particular condition, carried out before any symptoms necessarily appear. The aim is to catch potential problems earlier, when they are often easier to manage. Eligibility and recommended intervals depend on factors such as age, sex and personal or family risk.

  • Who is it recommended for?

    Recommendations vary depending on age, risk factors and, in some cases, national screening programme guidelines. If you're unsure whether you fall into a recommended group, a GP or the screening provider can advise based on your personal circumstances. Some people choose to have screening privately even outside standard eligibility criteria, after discussing this with a doctor.

  • Do I need to prepare for it?

    Preparation depends on exactly what the screening involves — some require no preparation, while others may ask you to avoid certain foods, medications or activities beforehand. Check the specific instructions provided when you book, since these vary by provider and by test type. Arriving prepared helps the appointment run smoothly.

  • What happens during the appointment?

    Most screening appointments are quick and straightforward, often involving a simple scan, measurement or blood test rather than anything invasive. Staff will explain each step as it happens and you can usually ask questions throughout. Most people are able to leave and resume normal activities immediately afterwards.

  • Is screening safe, and are there any risks?

    Screening tests are generally designed to be low-risk and non-invasive wherever possible. As with any test, there's a small chance of a false positive or false negative result, which is why unexpected findings are usually followed up with further, more detailed investigation. Your provider will explain any specific risks relevant to the particular screening test being offered.

  • How long until I get my results?

    Many screening results are available within a few working days, and in some cases you may be given an initial indication on the day. A doctor typically reviews the findings before you're given a full explanation of what they mean. You'll be told the expected timeframe when you book.

  • What happens if a result suggests something abnormal?

    An abnormal screening result is a prompt for further investigation, not a diagnosis in itself, and further tests will usually clarify what's actually going on. Many people who are called back for further checks after screening turn out not to have the condition being screened for. A doctor will guide you through what further tests, if any, are recommended.

  • Is this available through the NHS?

    Some screening is offered through NHS national screening programmes at set ages or intervals, while other checks fall outside standard NHS criteria. Where NHS screening applies, there may be a wait for your scheduled invitation; private screening is typically available sooner, often within days of booking. Cost for private screening varies by provider.

  • How reliable is this type of screening?

    Screening tests are generally well-validated for detecting the condition they're designed to look for, though no test is perfect and false positives or negatives can occur. This is why screening programmes usually include a clear follow-up pathway for anyone with an unexpected result. Discuss the specific accuracy of any test with your doctor if you'd like more detail.

  • How do I arrange AAA screening explained privately?

    You can typically book directly with a private clinic, often without needing a GP referral, with appointments usually available within a matter of days. This can be a good option if you want to be screened outside standard NHS eligibility criteria or simply want to be seen sooner. Contact the clinic to check current availability and what's involved.