What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCObservation

LOINC Code 13681-2: Beta aminoisobutyrate/Creatinine (U) [Mass ratio]

Name: LOINC Code 13681-2: Beta aminoisobutyrate/Creatinine (U) [Mass ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

13681-2 is a LOINC code used to identify Beta aminoisobutyrate/Creatinine (U) [Mass ratio] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Beta aminoisobutyrate/Creatinine. It is commonly used with the system or sample type Urine.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Beta aminoisobutyrate/Creatinine. It is commonly used with the system or sample type Urine.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: DISCOURAGED
Order vs observation: Observation

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Beta aminoisobutyrate/Creatinine [Mass Ratio] in Urine
Beta aminoisobutyrate/Creatinine
3-aminoisobutyrate; 3-aminoisobutyric acid; B; B-AIB; Chemistry; CR; Crea; Creat; Mass concentration ratio; Mass ratio; MCRto; Point in time; QNT; Quan; Quant; Quantitative; Random; UA; UCr; UR; Urn

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Beta aminoisobutyrate/Creatinine (U) [Mass ratio] (13681-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Beta aminoisobutyrate/Creatinine (U) [Mass ratio]Beta aminoisobutyrate/Creatinine [Mass Ratio] in UrineB-AIB/Creat UrBeta aminoisobutyrate/CreatinineCHEMBeta aminoisobutyrate/Creatinine, UrineMRto

Frequently asked questions

Code details

Code13681-2

SystemLOINC

Display nameBeta aminoisobutyrate/Creatinine (U) [Mass ratio]

DescriptionBeta aminoisobutyrate/Creatinine

Short nameB-AIB/Creat Ur

ComponentBeta aminoisobutyrate/Creatinine

PropertyMRto

TimingPt

System (specimen)Urine

ScaleQn

ClassCHEM

StatusDISCOURAGED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0k

Last changed2.44

Consumer names

Beta aminoisobutyrate/Creatinine, Urine

Part names

Beta aminoisobutyrate/CreatinineMRtoPtUrineQnMass RatioPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.