The ultrasound of the arteries of the lower extremities is performed in the case of:

leg pain that increases with walking and decreases with rest (so-called intermittent claudication),
poor skin condition of the feet and calves, impaired wound healing,
frequent feeling of cold feet,
high blood pressure, diabetes mellitus, poor blood test results (e.g. dyslipidaemia),
diagnosed atherosclerosis in a previous ultrasound examination,
post-operative checks on arteries.