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UK clinical guidance explained in clear, structured topics, with questions to help you put the detail to work. Built by doctors who know the journey from medical school to the ward.
Clinical guideline · Acute and Emergency
Abdominal Aortic Aneurysm (AAA)
Background Information
Definition
AAA is defined as a permanent localised dilatation of the abdominal aorta Ref
- Abdominal aortic diameter ≥3.0 cm, or
- Artery diameter ≥1.5 times the normal diameter
Guidelines
Investigation and Diagnosis
For a haemodynamically stable patient with suspected AAA, the first-line test is an aortic ultrasound.
Read the complete diagnostic pathway in the article.
Source: NICE guideline NG156Read the full topic
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Explore the question bankExample question · Abdominal aortic aneurysm01 / 01
A 72-year-old man attends his GP for a routine check. On examination, he is found to have a pulsatile abdominal mass. He is asymptomatic and haemodynamically stable.
What is the most appropriate first-line investigation?
Based on NICE NG156. For learning; follow the full guidance in clinical practice.
Follow the original guidance.
Topics are organised for study, with references to the underlying clinical guidance. You can check the source and read further whenever you need to.
See an article and its referencesNICE guideline NG156
Abdominal aortic aneurysm: diagnosis and management
Read recommendations at NICE Guideline Genius is an independent educational resource and is not endorsed by NICE.We built the resource we wanted during medical school.
We're Konstantinos Mantonanakis and Adams Lau. We studied medicine at Queen Mary University of London in Malta, and now work as doctors in the UK.
We know what it is like to turn long, changing guidelines into something you can understand for an exam and use in practice. Guideline Genius grew from that experience. Our aim is to make that work clearer for the students coming after us.
More about Guideline GeniusKonstantinos
Mantonanakis
Kumar and Clark Prize — highest overall five-year ranking across Queen Mary's London and Malta campuses.
MBBS with Distinction · third highest UKMLA score.
Began his resident doctor career at Russells Hall Hospital in Dudley.
Konstantinos's graduation postAdams
Lau
Patrick Pawsey Prize — highest UKMLA AKT score at Queen Mary.
High Commendation in the 2026 University of London Gold Medal viva; Glanfield Harris and Drapers' Company prizes.
Began FY1 on the Specialised Foundation Programme at Broomfield Hospital, Chelmsford.
Adams's graduation postStart with what you're studying.
01Cardiovascular30 topics02Respiratory27 topics03Endocrine and Metabolic36 topics04Neurosciences18 topics05Gastrointestinal including Liver29 topics06Renal and Urology27 topics
383 topics in this edition of the library. Coverage continues to grow.
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How the content is made.
Written by doctors who have been through the same exams, checked against the source guidance, and reviewed by other doctors before publication.
Meet the teamWho writes the articles?
Our doctors write the articles by hand. They read the original clinical guidance, select the detail that matters for learning, and structure each topic so you can move from the definition to diagnosis and management without losing the source. Multiple doctors review the content before it is published.
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Doctors write the clinical scenarios, answer choices and explanations. Each question is checked by other doctors for clinical accuracy, clear reasoning and a useful link back to the relevant article or guideline. The free packs let you try this approach before exploring the rest of the bank.
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Which sources do you use?
Articles are built around UK clinical guidance, including NICE and relevant specialty organisations where applicable. Sources are listed on each article, so you can check the original recommendation and see when the topic was last updated.
Who is Guideline Genius for?
It is primarily for clinical-year medical students preparing for UK exams. Junior doctors can also use it to return quickly to a topic and follow its references. For clinical decisions, always check the current source guidance and local policy.
What if something needs updating?
Use the feedback box on the article or contact the team. Tell us which statement or source needs attention; the doctors can review it against the latest guidance and update the article.
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