Test Directory

Useful for evaluating patients for loss of response, partial response on initiation of therapy, autoimmune or hypersensitivity reactions, primary nonresponse, reintroduction after drug holiday, endoscopic/computed tomography enterography recurrence (in inflammatory bowel disease), acute infusion reactions and proactive monitoring

Specimen Type: Serum

Preferred Collection Container: Red Top, Plain

Alternate Collection Container: Gold Top, Serum Separator

Desired Specimen Volume: 1 mL

1. Collect a red top, plain tube via venipuncture.

1. Separate serum from cells within 2 hours of collection.
2. Transfer 1 mL of serum to a clear aliquot tube (screw cap).

• Draw blood immediately before next scheduled dose (trough specimen).
• For 12 hours before specimen collection do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

Transport to the laboratory refrigerated. 

• Gross hemolysis
• Gross icterus

See patient report.

• Samples containing more than 12.5 ng/mL biotin (vitamin B7) may interfere (in the form of depressed signal) with INXAB / Infliximab Antibodies, Serum.
• This test does not differentiate between the originator and biosimilar products.

• Infliximab Quantitation with Reflex to Antibodies to Infliximab, Serum
• Remicade