Ustekinumab Quantitation with Antibodies, Serum

Message

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

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

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

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.