Lab Test

Tysabri Antibody

Tysabri® Antibody, Natalizumab

Test Codes

Mayo: FSABI, EPIC: LAB6449, Beaker: XTYAB

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: One plain Red-top tube.

Physician Office/Draw Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

In-Lab Processing

Let specimen clot 30-60 minutes then centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): unacceptable
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 6 months

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Clinic Laboratories in Rochester, MN. Forwarded to Viracor Eurofins.

Performed

Wednesday.
Results available in 8-15 days.

Reference Range

By report.

Test Methodology

Enzyme-Linked Immunosorbent Assay (ELISA).

Clinical Utility

Tysabri® (natalizumab) is a monoclonal antibody therapy used to treat multiple sclerosis (MS), a serious autoimmune disease that results in damage to the brain and spinal cord. Patients being treated with Tysabri can develop Tysabri-specific antibodies that may block the therapeutic effect of the treatment.

CPT Codes

83516
LOINC:  49598-6

Contacts

Last Updated

7/15/2021

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