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 5921-2: LDH (Dial fld) [Catalytic activity/Vol]

Name: LOINC Code 5921-2: LDH (Dial fld) [Catalytic activity/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

5921-2 is a LOINC code used to identify LDH (Dial fld) [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 Dial fld.

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 Dial fld.

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 Dialysis fluid
Lactate dehydrogenase
2-Hydroxypropanoic acid; 2-hydroxy-propionate; 2-hydroxy-propionic acid; Catalytic Concentration; Chemistry; Dehydrog; Dehyrdogenase; Diaf; Dialysate; Dialysis fluid; 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

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 (Dial fld) [Catalytic activity/Vol] (5921-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

LDH (Dial fld) [Catalytic activity/Vol]Lactate dehydrogenase [Enzymatic activity/volume] in Dialysis fluidLDH Dial fld-cCncLactate dehydrogenaseCHEMLactate Dehydrogenase (LDH), Dialysis fluidCCnc

Frequently asked questions

Code details

Code5921-2

SystemLOINC

Display nameLDH (Dial fld) [Catalytic activity/Vol]

DescriptionLactate dehydrogenase

Short nameLDH Dial fld-cCnc

ComponentLactate dehydrogenase

PropertyCCnc

TimingPt

System (specimen)Dial fld

ScaleQn

ClassCHEM

Example unitsarb U/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0b

Last changed2.68

Consumer names

Lactate Dehydrogenase (LDH), Dialysis fluid

Part names

Lactate dehydrogenaseCCncPtDial fldQnCatalytic ConcentrationPoint in time (spot)Dialysis fluid

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.