Inferior lower extremity bypass (LEB) outcomes have been reported among women with peripheral arterial disease (PAD), but the mechanisms responsible for this disparity are unknown. Great saphenous vein (GSV) is considered the conduit of choice for LEB; GSV diameter is associated with graft patency and therefore is often used as a criterion for suitability for use as bypass conduit. We hypothesized that gender-based differences in GSV may contribute to LEB outcomes disparities. To explore this hypothesis, we performed a gender-based analysis of GSV anatomic characteristics among patients with PAD who were studied with duplex ultrasound vein mapping during evaluation for LEB.