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Test ID: STR    
Striational (Striated Muscle) Antibodies, Serum

Secondary ID A test code used for billing and in test definitions created prior to November 2011


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


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

This test is a useful serological aid in the diagnosis of thymoma, especially in patients with onset of myasthenia gravis (MG) younger than 45 years.


It is more predictive of thymoma when accompanied by a muscle acetylcholine receptor (AChR) modulating antibody value of > or =90% AChR loss and is most predictive of thymoma when accompanied by CRMP-5-IgG.


It is useful as a screening test for MG in older patients, especially when tests for muscle AChR antibodies are negative.


Serial measurements are useful in monitoring the efficacy of immunosuppressant treatment in patients with MG.


Serial measurements are useful after treatment of thymoma. Measurements of muscle AChR binding, muscle AChR modulating antibody, and CRMP-5-IgG (if initially positive) are also recommended.


Serial measurements in recipients of D-penicillamine or bone marrow allografts may be useful in monitoring autoimmune complications and graft-versus-host disease, respectively.

Testing Algorithm Delineates situation(s) when tests are added to the initial order. This includes reflex and additional tests.

See Paraneoplastic Evaluation Algorithm in Special Instructions.

Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test

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

Enzyme Immunoassay (EIA)

Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name

Striational (Striated Muscle) Ab, S

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

Anti-Skeletal Muscle Antibodies
Anti-Striated Antibody
Muscle (Skeletal) Antibodies
Myasthenia Gravis Antibodies
Myoid Antibody
Skeletal Muscle Antibodies
Striational (Striated Muscle) Antibodies