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Ustekinumab Quantitation with Antibodies, Serum
Test Code39986
Preferred Specimen
0.5 mL serum
Patient Preparation
Collect immediately before the next dose of drug administration (trough level)
Minimum Volume
0.35 mL
Instructions
Collect immediately before the next dose of drug administration (trough level)
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: Unacceptable
Refrigerated: 21 days
Frozen: 21 days
Refrigerated: 21 days
Frozen: 21 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Heat-inactivated specimen
Methodology
Enzyme Linked Immunosorbent Assay (ELISA)
Setup Schedule
Set up: Tues, Fri; Report available: 1-4 days
Reference Range
See Laboratory Report
Clinical Significance
Evaluation of loss of response to therapy.
Quantification of ustekinumab in human serum.
Trough level quantitation for evaluation of patients treated with ustekinumab.
Detection of antibodies to ustekinumab in human serum.
Quantification of ustekinumab in human serum.
Trough level quantitation for evaluation of patients treated with ustekinumab.
Detection of antibodies to ustekinumab in human serum.

