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Ustekinumab Quantitation with Antibodies, Serum
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Test Code
USTEK
Alias/See Also
Stelara
CPT Codes
80299, 83520
Preferred Specimen
0.5 mL serum from an SST
Patient Preparation
Collect immediately before the next dose of drug administration (trough level)
Minimum Volume
0.35 mL
Other Acceptable Specimens
Serum from a Red Top tube
Instructions
Centrifuge SST, Transfer serum to a pour off tube
Transport Container
Pour off tube
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature = N/a
Refrigerated = 21 Days
Frozen = 21 days
Refrigerated = 21 Days
Frozen = 21 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, gross lipemia, heat-activated specimen
Methodology
Enzyme-Linked Immunosorbent Assay (ELISA)
Setup Schedule
Tuesday, Friday
Report Available
1 - 4 days
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
Performing Laboratory
Mayo Clinic Laboratories -- Rochester Superior Drive
3050 Superior Drive NW
Rochester, MN 55901
Last Updated: November 19, 2021
