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Gadolinium contrast medium is generally very safe. Side effects or reactions are uncommon, but can occur. In patients with normal kidney function, most of the gadolinium contrast medium injected (over 90%) is passed out in the urine within 24 hours.
The urinary system eliminates wastes, controls blood volume, regulates blood ion concentration and pH, and regulates red blood cell production. Functions of the Urinary System The kidneys excrete waste products. The kidneys control blood volume by regulating the volume of urine produced. The kidneys help regulate the concentration of major ions in the body fluids. The kidneys help regulate pH of the body fluids. The kidneys regulate the concentration of erythrocytes in the blood. The kidneys participate, with the skin and liver, in vitamin D synthesis. Urinary System Kidneys Each kidney is behind the peritoneum and surrounded by a renal capsule and a renal fat pad.