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HelpTest ID GUSAB Guselkumab Antibodies, Serum
Specimen Required
Only orderable as part of profile. For more information see GUSAP / Guselkumab Quantitation with Antibodies, Serum.
Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Supplies: Sarstedt Aliquot Tube 5 mL (T914)
Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.6 mL serum
Collection Instructions:
1. Draw blood immediately before next scheduled dose (trough specimen).
2. Within 2 hours of collection, centrifuge and aliquot serum into a plastic vial.
Secondary ID
623122Useful For
Evaluation of patients with loss of response to guselkumab, with recurrence of symptoms, or low or undetectable serum guselkumab measured at trough
Specimen Type
SerumSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 28 days |
| Frozen | 28 days | |
| Ambient | 14 days |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | Reject |
| Gross icterus | OK |
| Heat-treated specimens | Reject |
Reference Values
Only orderable as part of profile. For more information see GUSAP / Guselkumab Quantitation with Antibodies, Serum.
Antibodies to guselkumab
<9.8 ng/mL
Day(s) Performed
Thursday
Report Available
2 to 8 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
83520