16453-3

Beta aminoisobutyrate [Presence] in Urine

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Part Descriptions

LP15432-5 Beta aminoisobutyrate
3-Aminoisobutyric acid is a product formed by the catabolism of thymine. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See http://creativecommons.org/licenses/by-sa/3.0/ for details. Source: Wikipedia , Wikipedia

LP15432-5 Beta aminoisobutyrate
Beta aminoisobutyric acid (BAIB) is a nonprotein amino acid that is an end product of pyrimidine metabolism. The R and S enantiomers (previously named D-(minus)-BAIB and L-plus-BAIB) are produced from thymine and L-valine, respectively. Under normal circumstances, urine contains predominantly R-BAIB (from thymine) because it is eliminated by filtration and tubular secretion, while plasma contains about 80% S-BAIB (from valine), which is reabsorbed in the kidneys. In patients with dihydropyrimidine dehydrogenase deficiency, thymine catabolism is decreased, which results in moderately decreased CSF concentration and markedly decreased plasma concentration of BAIB. On the other hand, urine BAIB is elevated despite decreased breakdown of thymine, which indicates that there must be cross-over in the thymine and valine degradation pathways. PMID: 14705962 Deficiency of D-beta-aminoisobutyrate:pyruvate aminotransferase (EC 2.6.1.40) , an enzyme that is involved in the catabolism R-BAIB, also results in elevated urine BAIB and is associated with hyperuricemia. [OMIM: 210100] Source: Regenstrief LOINC , PMID: 14705962

Fully-Specified Name

Component: Beta aminoisobutyrate
Property: PrThr
Time: Pt
System: Urine
Scale: Ord
Method

Additional Names

Long Common Name: Beta aminoisobutyrate [Presence] in Urine
Short Name: B-AIB Ur Ql
Display Name: Beta aminoisobutyrate Ql (U)
Consumer Name Alpha Get Info: Beta aminoisobutyrate, Urine

Basic Attributes

Class: CHEM
Type: Laboratory
First Released: Version 1.0l
Last Updated: Version 2.56 (MIN)
Change Reason: The PrThr property is used for LOINC terms whose results are reported using an ordered categorical scale, regardless of whether or not an internal threshold was used to make that determination. This change was approved by the Laboratory LOINC Committee in June 2016.
Order vs. Observation: Observation

Language Variants Get Info

Tag	Language	Translation
de-DE	German (Germany)	Beta-Aminoisobutyrat:Nachweis oder Schwellenwert:Zeitpunkt:Urin:Ordinal:
el-GR	Greek (Greece)	β-αμινοϊσοβουτυρικό:PrThr:Pt:Ούρα:Ord: Synonyms: PrThr
es-AR	Spanish (Argentina)	beta aminoisobutirato:concentración arbitraria:punto en el tiempo:orina:ordinal:
es-ES	Spanish (Spain)	Beta aminoisobutirato:PrThr:Punto temporal:Orina:Ord:
es-MX	Spanish (Mexico)	Beta aminoisobutirato:Presencia o umbral:Punto temporal:Orina:Ordinal:
et-EE	Estonian (Estonia)	Beetaaminoisobutüraat:PrThr:Pt:U:Ord: Synonyms: Järgarvuline Juhuslik Uriin
fr-CA	French (Canada)	Bêta-aminoisobutyrate:Présence-Seuil:Temps ponctuel:Urine:Ordinal:
fr-FR	French (France)	Bêta aminoisobutyrate:Présence/Seuil:Ponctuel:Urine:Qualitatif:
fr-BE	French (Belgium)	Béta-aminoisobutyrate:PrThr:Temps ponctuel:Urine:Ordinal:
it-IT	Italian (Italy)	Beta aminoisobutirrato:PrThr:Pt:Urine:Ord: Synonyms: Chimica Presenza o Soglia Punto nel tempo (episodio)
ko-KR	Korean (Korea, Republic Of)	베타 아미노이소뷰티레이트:임의농도:검사시점:뇨:순위척도:
nl-NL	Dutch (Netherlands)	bèta-amino-isobutyraat:aanwezigheid:moment:urine:ordinaal:
pt-BR	Portuguese (Brazil)	Beta aminoisobutirato:ACnc:Pt:Urina:Ord: Synonyms: ; B-AIB; 3-aminoisobutyrate; 3-aminoisobutyric acid; Arbitrary concentration; Point in time; Random; Ur; UR; Urn; UA; Ql; Ordinal; QL; Qualitative; Qual; Screen; B; Chemistry
ru-RU	Russian (Russian Federation)	Бета аминоизобутират:PrThr:ТчкВрм:Моча:Пор: Synonyms: Бета-аминоизобутират Порядковый Точка во времени;Момент
tr-TR	Turkish (Turkey)	Beta aminoizobütirat:MevcEşik:Zmlı:İdrar:Srl: Synonyms: Mevcut
zh-CN	Chinese (China)	Beta 氨基异丁酸:存在情况或阈值:时间点:尿液:序数型: Synonyms: 3-氨基异丁酸;B-AIB;Beta-氨基异丁酸;β氨基异丁酸;β-氨基异丁酸 B β 依次型;分类顺序型;定性的;序数型（或称等级型）;性质上的;有序型;有序性分类应答;有序性分类结果;秩次型;等级型;筛查;顺序型化学;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存在情况;存在;存在与否;是否存在;阈值;界值;界限;阀值;临界值;存在情况（存在、存在与否、是否存在）或阈值（界值、界限、阀值、临界值）尿;小便;下泉时刻;随机;随意;瞬间贝塔

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Copyright © 2025 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.