Garden State Medical Group
October 8, 2026

NJ Patients: Ankle-Brachial Index, 0.90 Threshold, 2026 Guideline

NJ Patients: Ankle-Brachial Index, 0.90 Threshold, 2026 Guideline

The ankle-brachial index is a quick, noninvasive ratio test that compares blood pressure in your ankle to blood pressure in your arm to diagnose peripheral artery disease and flag your cardiovascular risk. We use it because it’s reliable and painless: a result of 0.90 or below signals PAD, while a reading above 1.40 often points to stiffened arteries rather than a clear answer.

TL;DR:

  • Calcified arteries in diabetic or kidney disease patients can produce falsely high ABI results, masking underlying arterial blockages.
  • Resting ABI is performed with cuffs on the arms and ankles, with blood pressure measured by Doppler, taking 10 to 20 minutes in a clinical setting.
  • An ABI below 0.90 indicates peripheral artery disease, with lower values signifying more severe disease and critical limb ischemia risk.
  • The test is recommended for high-risk individuals such as smokers, diabetics, and those with chronic kidney disease, regardless of symptoms.
  • When ABI results are ambiguous or suspect calcification, toe-brachial index, duplex ultrasound, or advanced imaging may be necessary for accurate diagnosis.
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Table of Contents

What the Ankle-Brachial Index Measures and How It’s Calculated

The ABI compares the systolic blood pressure at your ankle to the systolic blood pressure in your arm. We divide the higher ankle reading by the higher arm reading to get a simple ratio. When arteries in your legs are narrowed by plaque, blood pressure at the ankle drops relative to the arm, and the ratio falls below 1.0. That gap is what tells us something is restricting flow downstream.

Calcified, stiffened arteries complicate this picture. In some patients, especially those with diabetes or kidney disease, vessel walls become hard enough that the cuff cannot compress them properly, which pushes the ratio artificially high rather than showing the true blockage underneath.

  • The ratio reflects pressure difference, not blood volume or flow speed.
  • A falsely elevated ABI can mask real disease in calcified arteries.
  • When resting ABI isn’t clear, we may turn to the toe-brachial index (TBI), since toe arteries resist calcification more than larger vessels.

How the Resting ABI Test Is Performed Step by Step

We perform the resting ABI with you lying flat on your back for several minutes to let blood pressure stabilize. From there, the process follows a consistent sequence, as described by the Society for Vascular Surgery:

  1. Blood pressure cuffs are placed on both arms and both ankles.
  2. A handheld Doppler probe or oscillometric device detects pulse signals at each site.
  3. Systolic pressure is recorded at each arm and ankle location.
  4. We calculate the ratio for each leg using the higher of the two ankle pressures.

The whole exam typically takes 10 to 20 minutes and causes minimal discomfort, similar to a routine blood pressure check. If your resting results come back borderline or don’t match your symptoms, we may add an exercise ABI, asking you to walk on a treadmill before repeating the measurements to unmask disease that only shows up under exertion.

Pro Tip: Wear loose pants or bring shorts to your appointment so the cuffs can be placed directly on your skin without rolling up tight clothing.

Reading Your Results: Normal, Borderline, and Abnormal ABI Ranges

Clinicians rely on standard numeric cutoffs to interpret your ABI, and these ranges guide every decision that follows. According to Stanford Medicine 25, the accepted categories are:

  • 1.00 to 1.40: normal blood flow with no indication of significant arterial narrowing.
  • 0.90 to 0.99: borderline, which may warrant monitoring or further testing depending on symptoms.
  • 0.90 or below: consistent with peripheral artery disease.
  • Above 1.40: suggests non-compressible, calcified arteries rather than a reliable reading.

An ABI at or below 0.90 is the clinical threshold for diagnosing PAD, and the lower the number falls, the more severe the disease tends to be. A reading below 0.40, for example, often points to critical limb ischemia, a serious stage where tissue health is at risk. When the ABI lands in the non-compressible range or conflicts with your symptoms, we turn to the toe-brachial index or exercise testing to get a clearer picture of what’s happening in your vessels.

Who Should Get an ABI and When We Order One

The 2024 ACC/AHA/Multisociety guideline names resting ABI as the standard initial diagnostic test for anyone showing signs or symptoms of PAD, such as leg pain with walking, non-healing wounds, or diminished pulses. The guideline also considers ABI a reasonable screening option in patients who carry higher risk even without symptoms.

We typically recommend testing for:

  • Smokers or former smokers with a long history of tobacco use.
  • Adults with diabetes, particularly when combined with other risk factors.
  • Patients with chronic kidney disease.
  • Older adults with a family history of vascular disease or known coronary artery disease.

For patients who’ve already had a revascularization procedure, ongoing physical exams and periodic ABI checks remain part of long-term follow-up regardless of how the procedure went. In primary care, we often start with a resting ABI in the office and refer to a vascular lab only when results are ambiguous or when advanced imaging is needed to plan treatment.

What an Abnormal ABI Means for Your Heart and Long-Term Health

An abnormal ABI tells us more than your leg circulation status. It’s a window into your overall cardiovascular risk. A meta-analysis of ABI and cardiovascular outcomes found that an ABI of 0.90 or below independently predicts higher rates of major adverse cardiovascular events and death from any cause.

One reported subgroup in that analysis found significantly higher 10-year cardiovascular mortality among men with an ABI of 0.90 or below compared with men with a normal ABI. That’s a meaningful gap, and it’s why we treat an abnormal ABI as a trigger for broader evaluation, not just a leg finding.

A low ABI often leads to adjustments in medical therapy, including statins, antiplatelet medication, supervised exercise, and smoking cessation support. It also adds useful information to standard cardiovascular risk calculators, sometimes shifting a borderline risk profile into a category that calls for more aggressive prevention.

When ABI Falls Short: TBI, Duplex Ultrasound, and Imaging

ABI follow-up testing options illustration

ABI is a strong starting point, but it has blind spots. Medial arterial calcification, common in patients with diabetes or chronic kidney disease, can stiffen vessels enough to produce a falsely high reading that hides real disease underneath, according to NHLBI.

When we suspect this is happening, or when ABI results don’t match your symptoms, we turn to other tools:

  • Toe-brachial index (TBI): toe arteries resist calcification better, making this a more reliable option for heavily calcified vessels.
  • Duplex ultrasound: maps blood flow and pinpoints the location of blockages.
  • CTA or MRA: provides detailed anatomic imaging when revascularization is being planned.

For patients with non-healing wounds or suspected chronic limb-threatening ischemia, a fuller workup combining several of these tests is often necessary before any procedure moves forward.

Getting Ready for Your ABI Appointment

Preparing for an ABI test is straightforward, and a little planning helps the visit go smoothly. We recommend wearing loose, comfortable clothing that allows easy access to your arms and ankles, and bringing a list of current medications in case they affect your results.

  • Avoid vigorous exercise for at least an hour before a resting ABI.
  • Bring wound care supplies if you have an open sore on your foot or leg.
  • Mention any recent blood pressure cuff measurements using the correct cuff size, since an ill-fitting cuff anywhere can skew readings.
  • Expect the full visit, including setup, to run under 30 minutes in most cases.

Pro Tip: If you have diabetes or kidney disease, ask ahead of time whether a toe-brachial index might be added, since calcified arteries can make resting ABI less reliable for you specifically.

If your results come back abnormal, we’ll discuss next steps during the same visit, and in some cases, same-day referral to cardiopulmonary follow-up is appropriate.

ABI Testing and Follow-Up Care at Garden State Medical Group

We provide ABI testing as part of our onsite diagnostic services, and we fold your results directly into primary care and cardiopulmonary follow-up rather than leaving you to coordinate between separate offices. Scheduling works like other diagnostic visits: appointments can be booked, insurance information brought, and the test takes under half an hour.

If your ABI comes back abnormal, we walk you through what it means for your heart and vascular health and outline a follow-up plan that fits your specific risk factors, whether that means medication adjustments, lifestyle changes, or additional testing.

Clinical Perspective: When ABI Changes How We Manage Your Care

ABI is one of the most cost-effective tools we have for catching vascular disease before it becomes a crisis. A single abnormal reading often shifts our approach toward earlier statin therapy, antiplatelet medication, or structured exercise, and we believe timely communication of results, paired with a clear follow-up plan, matters as much as the test itself.

— Garden State Medical Group

Schedule Your ABI Test With Us

Getting an ABI test shouldn’t require juggling referrals across multiple offices. Garden State Medical Group

We offer ABI testing directly through our diagnostics services, and because primary care and cardiopulmonary care operate under the same roof, your results move straight into a follow-up plan without extra waiting or repeat paperwork. Most insurance plans, including Medicare and Medicaid, are accepted. If you’re due for screening or have symptoms worth checking, book a visit and we’ll take it from there.

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

FAQ

What is a normal ankle-brachial index?

A normal ABI falls between 1.00 and 1.40, indicating healthy blood flow between your arm and ankle. Readings between 0.90 and 0.99 are considered borderline, according to Stanford Medicine 25.

Why would a doctor order an ABI test?

Doctors order an ABI to diagnose peripheral artery disease in patients with leg pain, non-healing wounds, or diminished pulses. The 2024 ACC/AHA guideline also supports using it as a reasonable screening tool in higher-risk patients, including smokers and people with diabetes.

Can I test my ankle-brachial index at home?

The standard ABI test relies on specific equipment and trained technique, including properly sized cuffs and Doppler or oscillometric devices, which makes accurate at-home testing impractical. We recommend having it performed in a clinical setting where the measurement sequence and equipment meet established standards.

How to improve ankle-brachial index?

Improving your ABI usually starts with managing the underlying causes of arterial narrowing, including quitting smoking, managing blood sugar, and starting supervised exercise therapy. Medical therapies such as statins and antiplatelet medication are often added based on your specific risk profile and test results.

Sources

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