Warm Feet, Strong Warning: Simple Temp Test Spots Dangerous Leg Blood Flow

People on dialysis often have poor blood flow in their legs, making it hard to spot serious artery disease.

In a recent study, researchers followed 109 adults who were getting regular dialysis. They attached tiny wireless temperature sensors to the wrist and the sole of each foot. The sensors recorded skin temperature nonstop while the patients were in the dialysis chair.

When they looked at the temperature gap between wrist and foot at the end of each session, they found a clear pattern. Patients whose leg arteries showed blocked or absent flow had a bigger drop in foot temperature. Using this gap, a receiver‑operating‑characteristic chart showed that the test could tell apart abnormal blood flow in the lower‑leg arteries with an area under the curve around 62‑65%. A cutoff of –2.2 °C or lower gave a specificity close to 98% for detecting severe blockage in the posterior tibial artery.

Because the test uses cheap, wearable gadgets that work during normal dialysis, it could become a quick, non‑invasive way for doctors to catch dangerous leg artery disease early. This simple temperature check might save time and improve care for people on dialysis.