What is Intravenous urography IVU?
IVU is a radiographic technique that provides anatomic and functional information about the urinary tract but has now largely been replaced by CTU for most indications. Radiographic contrast material is administered intravenously, and a series of images are obtained to show the kidneys, ureters, and urinary bladder. Other synonyms used for this study are intravenous pyelography (IVP) and excretory urography .
Although IVP is probably the most commonly used term for this technique, it is inaccurate because pyelography literally means “a study of the renal pelvis.” IVU provides far more information than just an anatomic depiction of the renal pelvis alone. The term pyelography is reserved for retrograde studies in which only the collecting system is visualized.