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 74589-3: Succinate dehydrogenase/Citrate synthase (Tiss) [Catalytic ratio]

Name: LOINC Code 74589-3: Succinate dehydrogenase/Citrate synthase (Tiss) [Catalytic ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

74589-3 is a LOINC code used to identify Succinate dehydrogenase/Citrate synthase (Tiss) [Catalytic 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 Succinate dehydrogenase/Citrate synthase. It is commonly used with the system or sample type Tiss.

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 Succinate dehydrogenase/Citrate synthase. It is commonly used with the system or sample type Tiss.

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

Succinate dehydrogenase/Citrate synthase [Enzymatic activity ratio] in Tissue
Succinate dehydrogenase/Citrate synthase
Butanedioate; Butanedioic acid; Catalytic Concentration Ratio; Catalytic Ratio; CCrto; Chemistry; Cit Syn; Citric acid; Dehydrog; Dehyrdogenase; Enzymatic activity ratio; Point in time; QNT; Quan; Quant; Quantitative; Random; Succinic acid; Tissue; Tissue, unspecified

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 Succinate dehydrogenase/Citrate synthase (Tiss) [Catalytic ratio] (74589-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Succinate dehydrogenase/Citrate synthase (Tiss) [Catalytic ratio]Succinate dehydrogenase/Citrate synthase [Enzymatic activity ratio] in TissueSuccinate Dehydrog/Cit Syn Tiss-cRtoSuccinate dehydrogenase/Citrate synthaseCHEMSuccinate dehydrogenase/Citrate Synthase, TissueCRto

Frequently asked questions

Code details

Code74589-3

SystemLOINC

Display nameSuccinate dehydrogenase/Citrate synthase (Tiss) [Catalytic ratio]

DescriptionSuccinate dehydrogenase/Citrate synthase

Short nameSuccinate Dehydrog/Cit Syn Tiss-cRto

ComponentSuccinate dehydrogenase/Citrate synthase

PropertyCRto

TimingPt

System (specimen)Tiss

ScaleQn

ClassCHEM

Example unitsratio

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.48

Consumer names

Succinate dehydrogenase/Citrate Synthase, Tissue

Part names

Succinate dehydrogenase/Citrate synthaseCRtoPtTissQnCatalytic RatioPoint in time (spot)Tissue and Smears

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.