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A urinalysis is a group of chemical and microscopic tests using urine. They detect the byproducts of normal and abnormal metabolism, cells, cellular fragments, and bacteria in urine.
Urine is produced by the kidneys, two fist-sized organs located on either side of the spine at the bottom of the ribcage. The kidneys filter wastes out of the blood, help regulate the amount of water in the body, and conserve proteins, electrolytes, and other compounds that the body can reuse. Anything that is not needed is excreted in the urine, traveling from the kidneys to the bladder and then through the urethra and out of the body. Urine is generally yellow and relatively clear, but each time someone urinates, the color, quantity, concentration, and content of the urine will be slightly different because of varying constituents.
Many disorders can be diagnosed in their early stages by detecting abnormalities in the urine. Abnormalities include increased concentrations of constituents that are not usually found in significant quantities in the urine, such as: glucose, protein, bilirubin, red blood cells, white blood cells, crystals, and bacteria.
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