ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour intravenous pyelogram (IVP), an X-ray image of the human abdominal area which displays the drainage of urine from both kidneys down the ureters towards the bladder. IVP requires the prior intravenous injection of an iodine-based, radio-opaque contrast medium, which is excreted through the kidneys in urine. The branches of the renal pelvis - the structures of the kidney into which urine is drained - & the ureters (25-30 cm long in adults) are clearly defined in red. IVP tests kidney function & reveals stones in kidneys or ureters & other malfunctions of the urinary tract.
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