Intravenous Urograms (IVU)
This used to previously be the modality of choice but with the advent of non-contrast low dose IVU is no longer recommended.[13] IVU used to be seen as better than computed tomography (CT)-KUB, in assessing the degree of obstruction and facilitating decisions regarding further management. However, decisions on the ongoing management of renal colic are more often based around stone size and location and CT is superior at assessing these.