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Urea (urea nitrogen) in urine

 
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Last reviewed: 04.07.2025
 
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Urea excretion in urine is proportional to the protein content of the diet and the rate of metabolism of endogenous proteins. Urea excreted in urine accounts for approximately 90% of the nitrogen metabolites excreted from the body. In adults in a state of nitrogen equilibrium, the excretion of 500 mmol urea (or 14 g urea nitrogen) per day corresponds to the consumption of 100 g protein.

Reference values (norm) of urea (urea nitrogen) content in urine

The indicator under study

Urea content in urine

Mmol/day

G/day

Urea

Urea nitrogen

430-710

430-710

24-40

12-20

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