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Test Catalog

Test ID: MGMR    
Myasthenia Gravis Evaluation with Muscle-Specific Kinase (MuSK) Reflex, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Diagnosis for autoimmune myasthenia gravis (MG) in adults and children

 

Distinguishing autoimmune from congenital MG in adults and children or other acquired forms of neuromuscular junction transmission disorders

 

Establishing a quantitative baseline value that allows comparison with future levels if weakness is worsening

Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.

Test IDReporting NameAvailable SeparatelyAlways Performed
MGMRIMG with MuSK Interpretation, SNoYes
ARBIACh Receptor (Muscle) Binding AbYesYes

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
ACMFSAChR Modulating Flow Cytometry, SNoNo
MUSKMuSK Autoantibody, SYesNo

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

If acetylcholine receptor (AChR)-binding antibodies are greater than 0.02 nmol/L, then AChR muscle modulating antibody will be performed at an additional charge.

 

If AChR-binding antibodies are 0.02 nmol/L or less, then muscle-specific kinase (MuSK) autoantibody will be performed at an additional charge.

 

If unable to report AChR binding antibody due to interfering substances, then AChR muscle modulating antibody will be performed at an additional charge.

 

If unable to report AChR binding antibody due to interfering substances and AChR muscle modulating antibody is negative, then MuSK autoantibody will be performed at an additional charge.

 

See Myasthenia Gravis Evaluation with MuSK Reflex Algorithm in Special Instructions.

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

ARBI, MUSK: Radioimmunoassay (RIA)

ACMFS: Flow Cytometry

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.

Yes

Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

MG Evaluation MuSK Reflex, S

Aliases Lists additional common names for a test, as an aid in searching

Acetylcholine Receptor (Muscle AChR) Antibodies
Ach Receptor Ab
AChR (Acetylcholine Receptor)
AChR Receptor Blocking Ab
Anti-Skeletal Muscle Antibodies
Binding, Blocking, and Modulating Abs
Blocking Ab
Muscle End-Plate Antibodies
MUSK
MuSK myasthenia
Myasthenia Gravis Antibodies
Myasthenia Gravis
Myoid Antibody
Thymoma