Picture of Kidneys The kidneys are a pair of organs located in the back of the abdomen. Each kidney is about 4 or 5 inches long — about the size of a fist. The kidneys’ function are to filter the blood.
Computed tomography (CT) scan: A CT scanner takes a series of X-rays, and a computer creates detailed images of the kidneys. Magnetic resonance imaging (MRI) scan: A scanner uses radio waves in a magnetic field to make high-resolution images of the kidneys.
The kidneys are a pair of organs located in the back of the abdomen. Each kidney is about 4 or 5 inches long — about the size of a fist.