Duplex scanning involving B mode ultrasound imaging and integrated Doppler flow measurements by spectral analysis of intra‑abdominal, aorta and iliac arteries or inferior vena cava and iliac veins or of intra‑abdominal, aorta and iliac arteries and inferior vena cava and iliac veins, excluding pregnancy related studies, not being a service associated with a service to which an item in Subgroup 4 applies (R)