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 63537-5: Muscle specific receptor tyrosine kinase IgG IA (S) [Mass/Vol]

Name: LOINC Code 63537-5: Muscle specific receptor tyrosine kinase IgG IA (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:42.802Z

63537-5 is a LOINC code used to identify Muscle specific receptor tyrosine kinase IgG IA (S) [Mass/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 Muscle specific receptor tyrosine kinase Ab.IgG. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Muscle specific receptor tyrosine kinase Ab.IgG. It is commonly used with the system or sample type Ser.

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
Method: IA

What it does not mean

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

Key facts

Muscle specific receptor tyrosine kinase IgG Ab [Mass/volume] in Serum by Immunoassay
Muscle specific receptor tyrosine kinase Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; EIA; ELFA; ELISA; Enzyme immunoassay; IAA; Immune globulin G; Immunoglobulin G; Level; Mass concentration; MEIA; Musc; Muscl; MuSK; Point in time; QNT; Quan; Quant; Quantitative; Random; Rec; Recept; Receptors; Recp; Recptr; Serology; Serum; Spec; SR; SUDS; Tyr

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

Muscle specific receptor tyrosine kinase IgG IA (S) [Mass/Vol]Muscle specific receptor tyrosine kinase IgG Ab [Mass/volume] in Serum by ImmunoassayMuSK IgG Ser IA-mCncMuscle specific receptor tyrosine kinase Ab.IgGSEROMuscle specific receptor tyrosine kinase IgG antibody, BloodMCnc

Frequently asked questions

Code details

Code63537-5

SystemLOINC

Display nameMuscle specific receptor tyrosine kinase IgG IA (S) [Mass/Vol]

DescriptionMuscle specific receptor tyrosine kinase Ab.IgG

Short nameMuSK IgG Ser IA-mCnc

ComponentMuscle specific receptor tyrosine kinase Ab.IgG

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassSERO

Example unitsg/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.70

Consumer names

Muscle specific receptor tyrosine kinase IgG antibody, Blood

Part names

Muscle specific receptor tyrosine kinase Ab.IgGMCncPtSerQnIAMuscle specific receptor tyrosine kinase IgGMass ConcentrationPoint in time (spot)SerumImmunoassay

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.