Test Overview
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.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
INXAB: Monday, Wednesday, Friday
4 - 10 days
- FIAIA
- Infliximab Concentration and Anti-Infliximab Antibody
- Remicade
- Anser IFX Equivalent
- INFXR
- INXAB
Specimen Requirements
Collect specimen in a red top tube; do not use an SST tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate within 2 hours of collection.
Collect specimen in a red top tube (SST unacceptable) immediately before the next dose of Infliximab. Spin and aliquot into a screw capped plastic tube within 2 hours of collection. Send to Specimen Processing refrigerated.
Additional Information
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.