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 2534-6: LDH (U) [Catalytic activity/Vol]

Name: LOINC Code 2534-6: LDH (U) [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

2534-6 is a LOINC code used to identify LDH (U) [Catalytic activity/Vol] 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 Lactate dehydrogenase. 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 Lactate dehydrogenase. 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

Lactate dehydrogenase [Enzymatic activity/volume] in Urine
Lactate dehydrogenase
2-Hydroxypropanoic acid; 2-hydroxy-propionate; 2-hydroxy-propionic acid; Catalytic Concentration; Chemistry; Dehydrog; Dehyrdogenase; L.D.H; Lact; Lactic acid; Lactic acid dehydrogenase; LD; LDH; L-lactate; L-lactate dehydrogenase; Point in time; QNT; Quan; Quant; Quantitative; Random; Tumor marker; UA; 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 LDH (U) [Catalytic activity/Vol] (2534-6)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

LDH (U) [Catalytic activity/Vol]Lactate dehydrogenase [Enzymatic activity/volume] in UrineLDH Ur-cCncLactate dehydrogenaseCHEMLactate Dehydrogenase (LDH), UrineCCnc

Frequently asked questions

Code details

Code2534-6

SystemLOINC

Display nameLDH (U) [Catalytic activity/Vol]

DescriptionLactate dehydrogenase

Short nameLDH Ur-cCnc

ComponentLactate dehydrogenase

PropertyCCnc

TimingPt

System (specimen)Urine

ScaleQn

ClassCHEM

Example unitsarb U/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Lactate Dehydrogenase (LDH), Urine

Part names

Lactate dehydrogenaseCCncPtUrineQnCatalytic ConcentrationPoint 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.