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St. John Health System
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Myelin-Associated Glycoprotein (MAG-SGPG) Antibody IgM

Order Name SGPG AB
Test Number: 3660850
Revision Date 12/12/2022
Test Name Methodology LOINC Code
Myelin-Associated Glycoprotein (MAG-SGPG) Antibody IgM
Enzyme-Linked Immunosorbent Assay (ELISA) 31666-1 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2 mL (0.5 mL) Serum Clot Activator (SST or Red No-Gel) Refrigerated
Instructions Specimen Type: Red-top tube or gel-barrier tube
Specimen Storage: Refrigerate Stability: Refrigerate up to 5 days Frozen up to 1 year
Special Instructions: Testing referred to Immco Diagnostics TC 464
GENERAL INFORMATION
Expected TAT 18-22 days 
Clinical Use AKA: Sulfate-3-Glucuronyl Paragloboside (SGPG) Antibody, IgM
The majority of SGPG IgM positive sera will show reactivity against MAG. Patients that are SGPG IgM positive and MAG IgM negative may have multi-focal motor neuropathy with conduction block. 
Notes Labcorp Test Code: 808507
CPT Code(s) 83516
Internal Comments 9/21/15 cpt changes from 83520  to 83516
9/21/15 LOINC 31666-1 ADDED
5/11/22 change name from "Sulfate-3-Glucuronyl Paragloboside (SGPG) Antibody, IgM" to "Myelin-Associated Glycoprotein (MAG-SGPG) Antibody IgM"
Service Provided By Labcorp Oklahoma, Inc.
Lab Section Reference Lab