Background
For background on kidney function, see Renal function.One of the main roles of the kidneys in humans and other mammals is to aid in the clearance of various water-soluble molecules, including toxins, toxicants, and metabolic waste. The body excretes some of these waste molecules via urination, and the role of the kidney is to concentrate the urine, such that waste molecules can be excreted with minimal loss of water and nutrients. The concentration of the excreted molecules determines the urine's specific gravity. In adult humans, normal specific gravity values range from 1.001 to 1.030
Read more about this topic: Urine Specific Gravity
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—Mary Barnett Gilson (1877–?)
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—Friedrich Nietzsche (1844–1900)