Version 2.77


Urea nitrogen is the waste product formed in the liver when proteins are broken down into their respective amino acids. Once proteins are metabolized in the liver, urea nitrogen is released from the liver to the kidneys via the bloodstream. The kidneys then filter the urea nitrogen out of the bloodstream into the urine. Although the kidneys filter out most of the urea nitrogen in the blood, small traces of stable urea nitrogen remain in circulation. To evaluate kidney function, a blood urea nitrogen test (BUN test) is conducted. High amounts of urea nitrogen in the BUN test indicate complications with kidney function or decreased blood flow to the kidneys. A decrease in urea nitrogen in the BUN test is indicative of severe liver disease or malnutrition. [Lab Tests Online:bun/tab/sample/] Source: Regenstrief LOINC

Basic Part Properties

Part Display Name
Urea nitrogen
Part Type
Component (Describes the core component or analyte measured)
Created On
Construct for LOINC Short Name
Urea nit

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Language Variants Get Info

Tag Language Translation
zh-CN Chinese (China) 尿素氮
Synonyms: BUN;UN;血尿素氮;血尿素氮(Blood urea nitrogen,BUN,尿素氮);血液尿素氮
fr-CA French (Canada) Azote uréique
es-ES Spanish (Spain) Nitrógeno ureico
it-IT Italian (Italy) Azoto ureico
el-GR Greek (Greece) Άζωτο ουρίας
tr-TR Turkish (Turkey) Üre azotu
ru-RU Russian (Russian Federation) Азот мочевины крови
nl-NL Dutch (Netherlands) ureumstikstof
fr-BE French (Belgium) Azote uréique
Synonyms: BUN
pl-PL Polish (Poland) Azot mocznika