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.

LOINCActiveBoth

LOINC Code 25131-4: Pyridinoline/Creatinine (2H U) [Molar ratio]

Name: LOINC Code 25131-4: Pyridinoline/Creatinine (2H U) [Molar ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

25131-4 is a LOINC code used to identify Pyridinoline/Creatinine (2H U) [Molar 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 Pyridinoline/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 Pyridinoline/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: ACTIVE
Order vs observation: Both

What it does not mean

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

Key facts

Pyridinoline/Creatinine [Molar ratio] in 2 hour Urine
Pyridinoline/Creatinine
120 min; 120 minutes; 120min; 2 hours; 2HR; Chemistry; CR; Crea; Creat; PYD; Pyr; Pyridinium collagen crosslinks; QNT; Quan; Quant; Quantitative; Scrto; Substance concentration ratio; Substance ratio; 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 Pyridinoline/Creatinine (2H U) [Molar ratio] (25131-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Pyridinoline/Creatinine (2H U) [Molar ratio]Pyridinoline/Creatinine [Molar ratio] in 2 hour UrinePYD/Creat 2h Ur-sRtoPyridinoline/CreatinineCHEMPyridinoline/Creatinine, UrineSRto

Frequently asked questions

Code details

Code25131-4

SystemLOINC

Display namePyridinoline/Creatinine (2H U) [Molar ratio]

DescriptionPyridinoline/Creatinine

Short namePYD/Creat 2h Ur-sRto

ComponentPyridinoline/Creatinine

PropertySRto

Timing2H

System (specimen)Urine

ScaleQn

ClassCHEM

Example unitsnmol/mmol creatinine

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.00

Last changed2.73

Consumer names

Pyridinoline/Creatinine, Urine

Part names

Pyridinoline/CreatinineSRto2HUrineQnSubstance Ratio2 hours

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.