Ustekinumab Quantitation with Antibodies, Serum

Test Code

39986

CPT Codes
80299, 83520

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

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis • Grossly lipemic • Heat-inactivated specimen

Methodology
Enzyme Linked Immunosorbent Assay (ELISA)

Setup Schedule

Sets up 2 days a week.

Report Available

Reports in 1 to 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.

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.