Test directory: Infliximab Reflex to Infliximab Ab

Ordering Code 7785
Test Name Infliximab Reflex to Infliximab Ab
Alias Infliximab Quantitation with Reflex to Antibodies to
Infliximab, Serum
Remicade
Inflectra
Anti-TNF Inhibitor
Anti-Infliximab antibodies
Preferred Specimen Serum
Preferred Container Plain (Red)
Optimum Volume 1.5 mL
Collection Instructions 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

When infliximab results are below 5.1 mcg/mL, testing for antibodies to infliximab will be performed.
Handling Instructions Centrifuge and separate within 2 hours of collection.
Transport Requirements Oahu: Refrigerated
Airline: Frozen
Specimen Stability Ambient: Not Stable
Refrigerated: 28 Days
Frozen: 28 Days
Rejection Criteria Gel barrier tube, Grossly hemolyzed, Gross icterus
Avail. Stat NO
Analytic Time 10 Days
Methodology INFXR, INFX: Selective Reaction Monitoring Liquid
Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Reference Lab  Mayo Medical Lab

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Infliximab, S ALL mcg/mL See report.
Interpretation ALL See report.