A waste product of the breakdown of proteins by the liver that is transported to the kidneys and eliminated in the urine. Urea is also formed in the body from the breakdown of cell proteins. Kidney failure impairs the kidneys’ ability to eliminate urea and leads to uraemia; measurement of blood levels of urea is a routine kidney function test. Urea is used in various creams and ointments to treat skin disorders such as psoriasis.


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