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.

LOINCActiveObservation

LOINC Code 2158-4: CK.total/Creatine kinase.MB [Catalytic ratio]

Name: LOINC Code 2158-4: CK.total/Creatine kinase.MB [Catalytic ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

2158-4 is a LOINC code used to identify CK.total/Creatine kinase.MB [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 Creatine kinase.total/Creatine kinase.MB. It is commonly used with the system or sample type Ser/Plas.

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 Creatine kinase.total/Creatine kinase.MB. It is commonly used with the system or sample type Ser/Plas.

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: Observation

What it does not mean

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

Key facts

Creatine kinase.total/Creatine kinase.MB [Enzymatic activity ratio] in Serum or Plasma
Creatine kinase.total/Creatine kinase.MB
Cardio; Cardiology; Catalytic Concentration Ratio; Catalytic Ratio; CCrto; Chemistry; CK; CK 2; CK MB; CK-2; CKMB; CK-MB; CPK; Creatine phosphokinase; Enzymatic activity ratio; Heart Disease; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tot; Totl

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 CK.total/Creatine kinase.MB [Catalytic ratio] (2158-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

CK.total/Creatine kinase.MB [Catalytic ratio]Creatine kinase.total/Creatine kinase.MB [Enzymatic activity ratio] in Serum or PlasmaCK/CK MB SerPl-cRtoCreatine kinase.total/Creatine kinase.MBCHEMTotal Creatine Kinase (Total CK)/Creatine Kinase.MB, BloodCRto

Frequently asked questions

Code details

Code2158-4

SystemLOINC

Display nameCK.total/Creatine kinase.MB [Catalytic ratio]

DescriptionCreatine kinase.total/Creatine kinase.MB

Short nameCK/CK MB SerPl-cRto

ComponentCreatine kinase.total/Creatine kinase.MB

PropertyCRto

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsU/U

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Total Creatine Kinase (Total CK)/Creatine Kinase.MB, Blood

Part names

Creatine kinase.total/Creatine kinase.MBCRtoPtSer/PlasQnCatalytic RatioPoint in time (spot)Serum or Plasma

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.