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HelpTest ID GUSAP Guselkumab Quantitation with Antibodies, Serum
Specimen Required
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: 1.1 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
623123Useful For
Evaluation of patients with limited primary (initial) response to or secondary loss of response to guselkumab.
Testing Algorithm
For information see Ulcerative Colitis and Crohn Disease Therapeutic Drug Monitoring Algorithm.
Special Instructions
Specimen Type
SerumSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 28 days |
| Frozen | 28 days | |
| Ambient | 24 hours |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | Reject |
| Gross icterus | OK |
| Heat-treated specimens | Reject |
Reference Values
GUSELKUMAB QUANTITATION:
Guselkumab lower limit of quantitation = 0.5 mcg/mL
ANTIBODIES TO GUSELKUMAB:
<9.8 ng/mL
Day(s) Performed
Weekly
Report Available
2 to 9 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80299
83520
Forms
If not ordering electronically, complete, print, and send Gastroenterology and Hepatology Test Request (T728) with the specimen.