Blood urea nitrogen

Reference ranges for blood tests, comparing urea (yellow at right) to other blood constituents.

The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain between 6 and 20 mg of urea nitrogen per 100 ml (6–20 mg/dL) of blood. Individual laboratories will have different reference ranges as the assay used will vary between laboratories.

单词	Serum urea
释义	Serum urea 英语百科 Blood urea nitrogen The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain between 6 and 20 mg of urea nitrogen per 100 ml (6–20 mg/dL) of blood. Individual laboratories will have different reference ranges as the assay used will vary between laboratories.
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Serum urea

Blood urea nitrogen