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LOINC Code 49136-5: CK.MB [Ratio]

49136-5 is a LOINC code used to identify CK.MB [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.MB/Creatine kinase.total. 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.MB/Creatine kinase.total. 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.MB/Creatine kinase.total [Ratio] in Serum or Plasma
Creatine kinase.MB/Creatine kinase.total
Sometimes called "CK-MB mass/total CK activity-ratio" this parameter is now often referred to as the relative CK-MB index. The calculation100 x (CK-MB in ug/L/CK in U/L). The parameter is now reported as percent.
Cardio; Cardiology; Chemistry; CK; CK 2; CK MB; CK-2; CKMB; CK-MB; CPK; Creatine phosphokinase; Heart Disease; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; 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.

Common synonyms

CK.MB [Ratio]Creatine kinase.MB/Creatine kinase.total [Ratio] in Serum or PlasmaCK MB SerPl-RtoCreatine kinase.MB/Creatine kinase.totalCHEMCreatine Kinase-MB Form (CK-MB), BloodRatio

Frequently asked questions

Code details

Code49136-5
SystemLOINC
Display nameCK.MB [Ratio]
DescriptionCreatine kinase.MB/Creatine kinase.total
Short nameCK MB SerPl-Rto
ComponentCreatine kinase.MB/Creatine kinase.total
PropertyRatio
TimingPt
System (specimen)Ser/Plas
ScaleQn
ClassCHEM
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.21
Last changed2.73

Consumer names

Creatine Kinase-MB Form (CK-MB), Blood

Part names

Creatine kinase.MB/Creatine kinase.totalRatioPtSer/PlasQnPoint 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.

LOINC Code 49136-5 | HealthAssure