Duplex Doppler Sonography(DDS) is an imaging test for evaluating blood flow in the kidney or the renal system. B-mode ultrasonography is combined with Doppler ultrasonography, to locate and assess the renal artery and the velocity of blood flowing through it. This test is useful even in the presence of azotemia and for patients with hypertension, it is not necessary to relieve the administration of ACEIs. By assessing the velocity of blood flow, the doctors can measure whether the kidney is receiving enough blood and nutrients to function normally.
