How Circulation Testing Detects Artery Disease in the Legs
- Dr. Chandana Halaharvi
- 5 days ago
- 3 min read
Why the Feet Show Arterial Disease First
Peripheral artery disease narrows the arteries supplying the legs and feet, and it is substantially underdiagnosed. Estimates suggest a large share of people who have it do not know, partly because the earliest signs appear in the feet and are attributed to aging.
The feet reveal it first for a straightforward anatomical reason. They sit at the far end of the arterial tree, at the greatest distance from the heart and against gravity. When flow is reduced anywhere upstream, the tissue farthest downstream feels the shortage soonest.
Classic claudication, meaning calf pain that appears reliably after walking a set distance and resolves with rest, is the textbook symptom. Many patients never report it, because they have unconsciously reduced their walking or because neuropathy has blunted the pain signal that would otherwise warn them.
The signs a clinician looks for on examination are often subtle. Hair loss on the toes and lower legs, shiny thin skin, nails that grow slowly and thicken, coolness compared with the opposite limb, delayed capillary refill, and diminished or absent pulses at the top of the foot and behind the inner ankle.
Pulses alone are not reliable enough to settle the question. They can be difficult to feel in a swollen foot, and a small percentage of healthy people have a naturally absent dorsalis pedis pulse. Objective measurement is the point of formal testing.
What the Tests Measure
The ankle-brachial index is the standard first test and takes only a few minutes in the office. Blood pressure is measured at both arms and at both ankles using a Doppler probe, and the highest ankle pressure on each side is divided by the highest arm pressure.
A normal ratio falls between roughly 1.0 and 1.4. Values between 0.9 and 1.0 are borderline, 0.5 to 0.9 indicate mild to moderate disease, and below 0.5 suggest severe disease that warrants prompt vascular referral. The test is inexpensive, non-invasive, and requires no preparation.
Patients across Sugar Land, Pearland, and the greater Houston area rely on Thrive Foot and Ankle for circulation assessment as a routine part of diabetic foot care rather than as an afterthought.
Patients throughout the Houston area trust Dr. Chandana Halaharvi at Thrive Foot and Ankle to check circulation as part of a complete foot evaluation, and to coordinate vascular referral promptly when the findings call for it.
The index has a specific and clinically important failure mode. In patients with long-standing diabetes or kidney disease, calcium deposits stiffen the arterial walls so the vessel cannot be compressed by the cuff. This produces a falsely high reading, sometimes above 1.4, in a limb that actually has poor flow.
When that happens, toe pressures and the toe-brachial index are used instead, because the small digital arteries are usually spared from calcification. A toe pressure below roughly 30 millimeters of mercury indicates flow inadequate for wound healing. Transcutaneous oxygen measurement and arterial duplex ultrasound add further detail.
Why This Matters Before Any Procedure
Testing circulation before any elective foot procedure is not a formality. A surgical incision, an aggressive debridement, or even a routine nail procedure in a poorly perfused foot can create a wound that will not close, and a non-healing wound in an ischemic limb is a serious problem.
The same principle applies to wound care. An ulcer failing to heal despite excellent offloading and dressing technique may be failing because the tissue lacks the blood supply to heal at all. In that case the correct next step is vascular evaluation for possible revascularization, not another dressing change.
Finding peripheral artery disease also carries meaning well beyond the foot. Narrowed leg arteries indicate systemic atherosclerosis, and these patients carry substantially elevated cardiovascular risk. A podiatric finding frequently becomes the reason someone begins statin therapy, blood pressure management, and a smoking cessation program.
At Thrive Foot and Ankle, circulation assessment is part of evaluating foot problems, particularly for patients with diabetes or a history of smoking. Book an appointment online for a foot and circulation evaluation.
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