Version 2.78

Part Description

LP14492-0   Urea nitrogen
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

Fully-Specified Name

Component
Urea nitrogen/body weight
Property
RelMRat
Time
24H
System
Urine
Scale
Qn
Method

Additional Names

Long Common Name
Urea nitrogen/Body weight [Mass/kg/time] in 24 hour Urine
Short Name
UUN/BW 24h Ur-RelMRat
Display Name
Urea nitrogen/Body weight (24H U) [Relative mass/Time]
Consumer Name Alpha Get Info
Urea Nitrogen (BUN)/Body Weight, Urine

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.13
Last Updated
Version 2.70
Change Reason
Changed the divisor from 'kg body weight' to 'body weight'. The description and units make it clear that it is per kg.
Order vs. Observation
Observation

Language Variants Get Info

Tag Language Translation
es-AR Spanish (Argentina) kg de peso corporal:índice de masa:24 horas:orina:cuantitativo:
es-ES Spanish (Spain) Nitrógeno ureico/peso corporal:RelMRat:24 horas:Orina:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Nitrógeno ureico / peso corporal:Tasa de masa relativa:24H:Orina:Cuantitativo:
fr-FR French (France) Urée/poids corporel:Masse relative/Temps:24H:Urine:Numérique:
it-IT Italian (Italy) Azoto ureico/Peso corporeo:RelMRat:24h:Urine:Qn:
Synonyms: 24 Ore Chimica Indice di massa relativa
ko-KR Korean (Korea, Republic Of) 요소 질소/kg 체중:질량율:24시간:뇨:정량:
nl-NL Dutch (Netherlands) ureumstikstof/lichaamsgewicht:relatieve massa/tijd:24 uur:urine:kwantitatief:
Synonyms: 24U
pl-PL Polish (Poland) Azot mocznika/masa ciała:względna ilość masy w czasie:24 godziny:mocz:ilościowy:
Synonyms: Azot mocznika/masa ciała Ciężar Masa ciała
pt-BR Portuguese (Brazil) Uréia nitrogenada/ kg de peso corpóreo:MRat:24H:Urina:Qn:
Synonyms: ; Urea Nit; UN; Blood urea nitrogen; Wt; N2; N; Bdy weight; kg BW; mRate; Mass rate; 1 day; 24 hours; 24HR; UR; Urn; UA; Quantitative; QNT; Quant; Quan; bod; Bodies; Chemistry; UUN
ru-RU Russian (Russian Federation) Азот мочевины крови/Масса тела:ОтнМасРасх:24 часа:Моча:Колич:
Synonyms: Количественный Относительный массы расход;Относительная массовая скорость
zh-CN Chinese (China) 尿素氮/体重:相对质量速率:24小时:尿液:定量型:
Synonyms: 1天;1日;24.0小时;一天;一日;二十四个小时;二十四小时 BUN;UN;血尿素氮;血尿素氮（Blood urea nitrogen，BUN，尿素氮）;血液尿素氮 CO(NH2)2;碳酰二胺;脲 N;N2;Nit;氮气 UUN 化学;化学检验项目;化学检验项目类;化学类;化学试验;非刺激耐受型化学检验项目;非刺激耐受型化学检验项目类;非刺激耐受型化学试验;非刺激耐受型化学试验类 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 尿;小便;下泉 尿尿素氮 尿液尿素氮（Urine Urea nitrogen，UUN） 尿液脲氮 尿脲氮 标本重量;重 物体 相对质量速度 身体重量

Example Units

Unit Source
mg/(24.h)/kg Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=35657-6