Why does urine always contain urea?
Urea is a product of protein metabolism. During this process, nitrogen is removed from the blood and converted to urea. Urea is then excreted by the kidneys in the urine. In fact, it is how urine got its name.DefinitionUrea, a waste product from the breakdown of protein, is found in the blood, the kidneys filter the blood of this and other wastes. The kidneys are able to excrete urea and other waste in the form of urine.TestingTo test the level of urea in your urine, a 24-hour urine collection is performed. The normal range for adults is 12 to 20g of urea produced in a 24 hour period.Other TestsUrine is not the only place we find urea. Another way to test for urea is by blood test. A Blood Urea Nitrogen test, BUN for short, can be performed. Instead of measuring how much urea has been excreted by the kidneys as urine, the BUN tests for urea returned to the blood supply after the blood has been filtered by the kidneys.SignificanceDecreased levels of urea in urine are typically due to ki
