Days Set Up
Monday, Wednesday, Thursday
Analytic Time

4 - 10 days

MiChart Code
Infliximab and Anti-Infliximab Ab
Soft Order Code

Test Updated:


Infliximab Concentration and Anti-Infliximab Antibody
Anser IFX Equivalent

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Selective Reaction Monitoring LC-MS/MS; Electrochemiluminescent Bridging Immunoassay

Test Usage

Trough level quantitation for evaluation of patients with loss of response to infliximab.

Reference Range

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.

Specimen Requirements


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.

Yellow Top Tube
Red Top Tube
Normal Volume
1 mL serum
Minimum Volume
0.5 mL serum

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.