urea nitrogen

urea (u-re´ah)

1. the chief nitrogenous endproduct of protein metabolism, formed in the liver from amino acids and from ammonia compounds; found in urine, blood, and lymph.

2. a pharmaceutical preparation of urea used to lower intracranial or intraocular pressure, to induce abortion, and as a topical skin moisturizer.ure´al

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urea nitrogen  the urea concentration of serum or plasma, conventionally specified in terms of nitrogen content and called blood urea nitrogen (BUN); an important indicator of renal function.

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urea nitrogen

n.

The concentration of nitrogen in blood or urine, for example, derived from urea.

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urea nitrogen.

See blood urea nitrogen.

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urea

1. the diamide of carbonic acid found in urine, blood and lymph, the chief nitrogenous constituent of urine, and the chief nitrogenous end product of protein metabolism; it is formed in the liver from amino acids and from ammonia compounds.

2. a pharmaceutical preparation of urea occasionally used to lower intracranial pressure.

3. industrial urea is used as a fertilizer and feed additive for ruminants. Overfeeding or accidental access to large amounts can cause fatal poisoning.

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urea cycle

see urea cycle.

urea cycle enzyme deficiency

see arginosuccinate synthetase, citrullinemia.

urea hydrogen peroxide

see carbamide peroxide.

urea nitrogen

the urea concentration of serum or plasma, conventionally specified in terms of nitrogen content and called blood urea nitrogen (BUN), an important indicator of renal function.

urea poisoning

causes tremor, dyspnea, abdominal pain, incoordination, bellowing, convulsions and death in 2 to 4 hours. Due to hyperammonemia.

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urea nitrogen

See BUN.