Selective Reaction Monitoring LC-MS/MS; Electrochemiluminescent Bridging Immunoassay
Trough level quantitation for evaluation of patients with loss of response to infliximab.
Therapeutic concentrations of infliximab may vary according to the disease.
4 - 10 days
- Infliximab Concentration and Anti-Infliximab Antibody
- Anser IFX Equivalent
Collect specimen in a red top tube; do not use an SST tube. Centrifuge, aliquot serum into a plastic vial, and freeze (preferred) or refrigerate.
Test includes infliximab quantitation by LC-MS/MS. If infliximab concentration is <5.1 mcg/mL, infliximab antibodies (INXAB) will be performed at an additional charge. (Will be ordered by the interface IF needed, do not order in Soft) By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated. Test sent to Mayo Medical Laboratories.