Test ID: MGETH
Myasthenia Gravis (MG) Evaluation, Thymoma
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
Useful For Suggests clinical disorders or settings where the test may be helpful
Investigating patients with suspected or proven thymoma, whether or not symptoms or signs of myasthenia Gravis (MG) are present
Serially monitoring patients for recurrence or metastasis after removal of thymoma
Providing a quantitative autoantibody baseline for future comparisons in monitoring a patient's clinical course and the response to thymectomy and immunomodulatory treatment
Assessing the likelihood of occult thymoma in a patient with an acquired disorder of neuromuscular or autonomic transmission
Evaluating bone marrow transplant recipients with suspected graft-versus-host disease, particularly if there is evidence of weakness
Confirming that a recently acquired neurological disorder has an autoimmune basis (eg, MG or dysautonomia)
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 ID | Secondary ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|---|
| ARBI | 8338 | ACh Receptor (Muscle) Binding Ab | Yes | Yes |
| ARMO | 83378 | ACh Receptor (Muscle) Modulating Ab | No | Yes |
| STR | 8746 | Striational (Striated Muscle) Ab, S | Yes | Yes |
| CRMWS | 83107 | CRMP-5-IgG Western Blot, S | No | Yes |
| GANG | 84321 | AChR Ganglionic Neuronal Ab, S | No | Yes |
| VGKC | 89165 | Neuronal (V-G) K+ Channel Ab, S | No | Yes |
| GD65S | 81596 | GAD65 Ab Assay, S | Yes | Yes |
Testing Algorithm Delineates situation(s) when tests are added to the initial order. This includes reflex and additional tests.
Recommended for investigation of: 1) a patient with suspected or proven thymoma, whether or not symptoms or signs of MG are present (also of value for serially monitoring patients after removal of thymoma; a rising autoantibody titer may herald tumor persistence or recurrence), or emergence of an unrelated neoplasm and 2) a bone marrow transplant recipient with suspected graft-versus-host disease, particularly if there is evidence of weakness.
See Myasthenia Gravis: Thymoma Diagnostic 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
ARBI/8338, ARMO/83378, GANG/84321, GD65S/81596, VGKC/89165: Radioimmunoassay (RIA)
STR/8746: Enzyme Immunoassay (EIA)
CRMWS/83107: Western Blot
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Aliases Lists additional common names for a test, as an aid in searching
AChR (Acetylcholine Receptor)
Anti-Skeletal Muscle Antibodies
Muscle End-Plate Antibodies
Myasthenia Gravis Antibodies
Myoid Antibody
Striational (Striated Muscle) Antibodies
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