Population will be patients recruited from the University of Utah and Salt Lake City Veteran Affairs Medical Center. The intended gender distribution of the subjects will be approximately equal. There will be no gender based enrollment restrictions. The age range of the subjects is 18-95. No children will be recruited, as peripheral arterial disease is a disease of adulthood, with increased prevalence in the elderly population. There are no enrollment restrictions based upon race or ethnic origin. Patients with stents may be included.