Proactive Screening for Peripheral Arterial Disease: The Role of Ankle-Brachial Pressure Testing

Published: 22 October 2026 | Next Review Due: 22 October 2027

Introduction

Peripheral arterial disease (PAD) affects blood flow to the limbs and is frequently associated with broader cardiovascular risk. Because symptoms are not always obvious, some cases go unrecognised until complications arise. The ankle-brachial index test — a non-invasive comparison of blood pressures at the ankle and arm — can form part of a clinical assessment for PAD in appropriate individuals. Understanding when such testing may be relevant, and what it can and cannot tell you, is an important starting point.

Featured Snippet: What Is the Role of Ankle-Brachial Pressure Testing in Assessing Peripheral Arterial Disease?

The ankle-brachial index (ABI) test compares systolic blood pressure at the ankle with systolic blood pressure at the arm to help evaluate blood flow in the lower limbs. It is used to support clinical assessment for peripheral arterial disease where symptoms or risk factors suggest it may be warranted.

Key points:

• The ABI test is a non-invasive tool that can indicate reduced arterial blood flow to the legs.
• It is generally considered when a person has relevant symptoms or a clinical risk profile, not as routine screening for all adults.
• Results require clinical interpretation and can be affected by conditions such as arterial calcification.
• An abnormal result alone does not confirm a diagnosis; further investigation may be required.
• A normal result does not exclude all forms of vascular disease.

What Is Peripheral Arterial Disease?

Peripheral arterial disease is a circulatory condition in which narrowed arteries reduce blood flow to the limbs — most commonly the legs. The underlying mechanism is usually atherosclerosis: a gradual build-up of fatty plaques within arterial walls that causes them to harden and narrow over time.

PAD is associated with the same risk factors as coronary artery disease and stroke. These include:

• Smoking — one of the strongest modifiable risk factors
• Type 2 diabetes — which can also affect nerve function, masking symptoms
• High blood pressure (hypertension)
• High cholesterol (hypercholesterolaemia)
• Increasing age — prevalence rises significantly in people over 50
• A personal or family history of cardiovascular disease

PAD matters not only because of its direct effects on limb function, but because it is a recognised marker of generalised arterial disease. People with confirmed PAD have a higher risk of heart attack and stroke than the general population, according to NHS and NICE guidance.

Possible symptoms of PAD include pain, cramping or heaviness in the legs during walking or physical exertion that is relieved by rest — a pattern sometimes called intermittent claudication. Other presentations may include cold feet, changes in skin colour or texture, slow-healing wounds on the feet or lower legs, and in more advanced cases, pain at rest. However, a significant proportion of people with PAD experience no clear symptoms, which is one reason that clinically directed assessment may be relevant for those with elevated risk.

What Is an Ankle-Brachial Index Test?

The ankle-brachial index test — sometimes called the ankle-brachial pressure index (ABPI) — is a straightforward, non-invasive procedure that compares blood pressure readings taken at the ankle with those taken at the upper arm. The ratio produced can help indicate whether blood is flowing normally through the arteries of the lower limbs.

During the test, a standard blood pressure cuff is applied to the upper arm and then to the ankle, typically just above the foot. A small hand-held Doppler ultrasound device is used to detect blood flow sounds, helping to identify when blood is flowing past the cuff at each site. The systolic pressure recorded at the ankle is divided by the systolic pressure recorded at the arm to produce the ABI ratio.

The ankle-brachial pressure index is generally considered a useful first-line tool in the vascular assessment pathway. It does not use ionising radiation, requires no injections or needles, and can be performed in a clinical or community setting. For people concerned about peripheral artery disease risk factors, understanding what the test involves may help reduce anxiety about the assessment process.

If you are considering whether vascular screening options may be appropriate, it is worth reviewing what different providers include as part of their assessment process.

Who May Need Assessment for PAD?

Not everyone needs ankle-brachial index testing. Clinical guidelines from NICE and NHS sources generally support ABI assessment for individuals who present with symptoms consistent with PAD — particularly exertional leg pain — or who have a combination of risk factors that prompt clinical concern.

Testing is most likely to be clinically appropriate for individuals who:

• Experience leg pain or cramping during walking that resolves with rest
• Have non-healing wounds or ulcers on the feet or lower legs
• Have multiple cardiovascular risk factors and symptoms suggesting reduced circulation
• Are being assessed for cardiovascular risk as part of a broader clinical review
• Have a clinical reason to investigate unexplained changes in foot temperature, colour or sensation

Peripheral arterial disease screening is not universally recommended for asymptomatic adults without risk factors. The decision to carry out an ABI test should be guided by a clinician who can take into account the individual's medical history, current symptoms and overall risk profile — not by risk factors alone.

For those who are interested in understanding their broader cardiovascular health profile, comprehensive health screening assessments offered by private providers may include relevant evaluations; however, service availability and clinical scope should always be confirmed directly with the provider before booking.

What Can ABI Results Tell You?

An ABI ratio is generally interpreted within a clinical framework. As a broad guide — based on established vascular literature and NICE guidance — values are often interpreted as follows:

These ranges provide a broad framework and must not be used for self-diagnosis. Clinical interpretation always requires consideration of the individual's symptoms, examination findings and medical history.

An important limitation of the ankle-brachial pressure index is that it can produce misleadingly elevated or uninterpretable readings when arteries are calcified and therefore difficult to compress with a cuff. This is more common in people with long-standing diabetes or chronic kidney disease. In such cases, alternative investigations — such as toe-brachial pressure measurement or Doppler waveform analysis — may be required.

Similarly, a result within the normal range does not completely exclude PAD, particularly if symptoms remain unexplained. The test is a supportive clinical tool, not a standalone diagnostic test.

What Happens Before, During and After the Test?

Preparation requirements and appointment arrangements vary by clinical setting and provider. Generally, the test is straightforward and does not require fasting or significant preparation, though you may be asked to rest quietly before readings are taken, as physical activity can temporarily affect blood pressure measurements.

During the assessment, you will typically lie down while readings are taken from both arms and both ankles. The Doppler probe is applied with gel over the skin and produces an audible sound corresponding to arterial blood flow. The procedure is not painful, though the cuff inflation may cause brief discomfort, as with any blood pressure measurement.

After the test, a clinician or appropriately qualified assessor will review and interpret the results. Service arrangements, report turnaround and the availability of clinical follow-up vary depending on the setting. Anyone considering private health screening services should confirm what is included, what clinical oversight is provided and how results are communicated before proceeding.

What Happens If PAD Is Suspected?

If an ABI result or clinical assessment raises the possibility of PAD, the next steps will depend on the individual's overall clinical picture. A GP or specialist may consider:

• Further vascular investigations, such as duplex ultrasound imaging of the affected arteries
• Referral to a vascular surgery or vascular medicine specialist
• A structured review of modifiable cardiovascular risk factors, including blood pressure, cholesterol, blood glucose and smoking status
• Supervised exercise programmes, which have an established evidence base for managing intermittent claudication
• Medication review, including consideration of antiplatelet therapy and cardiovascular risk reduction strategies where clinically appropriate

ABI testing alone does not determine a management plan. It is one element within a broader clinical assessment. Those who have received results through a private provider should share these with their GP, who can contextualise the findings within their full medical history.

For those interested in understanding cardiovascular risk more broadly, cardiovascular health checks from private screening organisations may provide useful baseline information — though clinical management decisions remain within the remit of a registered healthcare professional.

When Should You Seek Medical Advice?

If you experience persistent leg pain during walking, particularly pain that is relieved by rest, or if you have noticed slow-healing wounds on your feet or lower legs, you should discuss these symptoms with your GP. These presentations warrant appropriate clinical assessment rather than a wait-and-see approach.

If you have risk factors for PAD — such as a long history of smoking, poorly controlled diabetes or established cardiovascular disease — and you are concerned about your circulation, raising this during a routine GP appointment is a reasonable and appropriate step.

⚠️ Emergency Warning: Sudden severe pain in a limb, a limb that becomes suddenly cold, pale, numb or weak, or loss of sensation or movement in a leg or foot may indicate acute limb ischaemia — a time-critical emergency. Do not wait for a screening appointment. Call 999 or attend your nearest A&E immediately.

Private screening assessments are not a substitute for emergency or urgent NHS care.

Frequently Asked Questions

1. What does an ankle-brachial index test measure?

The ankle-brachial index test measures the ratio of systolic blood pressure at the ankle to systolic blood pressure at the arm. This ratio helps indicate whether blood is flowing efficiently through the arteries supplying the lower limbs and can support clinical assessment for peripheral arterial disease when considered alongside symptoms and history.

2. Is ABI testing suitable for everyone?

No. ABI testing is generally considered when a person has symptoms suggestive of PAD or a clinical risk profile that warrants further evaluation. It is not currently recommended as routine screening for all asymptomatic adults. A clinician is best placed to advise whether the test is appropriate for a specific individual.

3. Can an ABI test detect all cases of PAD?

No. The ankle-brachial pressure index is a useful clinical tool but has recognised limitations. It may produce unreliable results in people with calcified, non-compressible arteries — a finding more common in diabetes and chronic kidney disease. Some people with mild or atypical PAD may have results within the normal range. Further investigation may be needed in such cases.

4. Does an abnormal ABI result confirm PAD?

Not on its own. An abnormal ABI result is clinically significant and warrants further evaluation, but it should be interpreted alongside symptoms, physical examination and, where appropriate, additional vascular investigations. Results should always be reviewed by a qualified healthcare professional in the context of the individual's full clinical picture.

5. Is ABI testing painful?

The test is generally well tolerated and not considered painful. It involves blood pressure cuff inflation at the arm and ankle and the use of a hand-held Doppler probe on the skin surface. Some people find cuff inflation briefly uncomfortable, as with a standard blood pressure check. No needles or injections are involved.

6. What should I do if I have leg pain despite a normal ABI result?

Persistent or unexplained leg pain should always be assessed by a clinician, even if a previous ABI result was within the normal range. Leg pain has multiple potential causes — musculoskeletal, neurological and vascular — and a normal ABI does not exclude all possibilities. Your GP can help determine whether further investigation is appropriate.

Exploring Private Health Screening Options

For individuals who would like to take a more proactive approach to understanding their vascular and cardiovascular health, some private health screening providers offer assessments that may include elements of circulatory evaluation. Health Screening Clinic is one such provider offering health screening services; readers should review the provider's current website to confirm which specific tests are available, what clinical interpretation is included and how results are followed up.

Service availability, fees, test arrangements and the scope of any clinical interpretation should be confirmed directly with the provider. Private screening does not replace GP assessment, NHS diagnostic pathways or urgent medical care. If you have concerns about your circulation or cardiovascular health, speaking with your GP remains the most appropriate first step.

This article is intended for general informational purposes only and does not constitute medical advice, diagnosis or treatment. Peripheral arterial disease and other causes of leg symptoms require appropriate clinical assessment. Screening and diagnostic tests have limitations and must be interpreted in context. Seek prompt medical advice for persistent or concerning symptoms. Sudden severe limb pain, a cold or pale limb, or new numbness or weakness may require emergency assessment. Call 999 or attend A&E if you suspect a limb-threatening emergency.

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