The blood flow of iliac arteries was measured by means of an improved angiographic cinedensitometric technique. This consists of cineradiographic recording of contrast injection into the iliac arteries, followed by optical analysis of the “washout” phase of the contrast material at selected sites. In 25 patients without peripheral vascular disease, undergoing abdominal angiography for different reasons, the blood flow measurements in left iliac arteries were within the limits of 371-766 ml/min. No age differences were noted but the blood flow in females were significantly lower than in males. In 10 patients with peripheral vascular diseases, the blood flow measurements varied from 166 to 506 ml/min. which is significantly lower compared to the “normal” controls. Precision of the technique was determined by “in vitro” measurements and was ± 5%.