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Tysabri® Antibody Test
Test Code19215
CPT Codes
83516
Preferred Specimen
2 mL serum
Minimum Volume
0.5 mL
Instructions
Please label each specimen tube with two forms of patient identification. These forms of identification
must also appear on the requisition form.
Collect whole blood in a red top tube (no-gel) or a serum separator tube, let it clot for at least 30 minutes
at room temperature and centrifuge within 1 hour of collection. Transfer the serum to a plastic screwcap
vial for transport to the laboratory.
must also appear on the requisition form.
Collect whole blood in a red top tube (no-gel) or a serum separator tube, let it clot for at least 30 minutes
at room temperature and centrifuge within 1 hour of collection. Transfer the serum to a plastic screwcap
vial for transport to the laboratory.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 72 hours
Refrigerated: 28 days
Frozen: 6 months
Refrigerated: 28 days
Frozen: 6 months
Methodology
Enzyme Linked Immunosorbent Assay (ELISA)
Setup Schedule
Set up: Fri; Report available: 7-10 days
Clinical Significance
Antibodies against natalizumab (Tysabri) are found in 4.5% to 14.1% of natalizumab-treated multiple sclerosis patients.
