New drugs such as Tysabri® offer highly specific and effective therapy for Multiple sclerosis patients. However, Tysabri® loses effectiveness when patients develop antibodies to the drug. Detecting these antibodies early allows healthcare providers the opportunity to prescribe alternative therapy and avoid the cost associated with failed therapy.
Frozen (preferred) - 2 weeks
Refrigerated (OK) - 2 weeks
Enzyme-linked immunosorbent assay (ELISA)