FIELD: medicine, particularly, surgery of vessels. SUBSTANCE: method includes scanning of vein fragment with detected reflux flow. In so doing, flow form and its relation to vein internal contour are determined. Presence of any of six possible forms is stated. Each form strictly corresponds to one of types of vein valve defects, such as continuous, incorrect, central, eccentric, diametrically nonfilled, diametrically filled. EFFECT: higher accuracy and noninvasive nature of diagnosis. 1 ex
