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HelpTest ID RISAP Risankizumab 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: 1.5 mL
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
621813Useful For
Evaluation of patients with limited primary (initial) response to or secondary loss of response to risankizumab
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 |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | Reject |
| Gross icterus | OK |
| Heat-treated specimens | Reject |
Reference Values
RISANKIZUMAB QUANTITATION:
Risankizumab lower limit of quantitation =1.0 mcg/mL
RISANKIZUMAB ANTIBODIES:
Antibodies to risankizumab: <20.0 ng/mL
Day(s) Performed
Weekly
Report Available
2 to 9 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80299
82397
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Gastroenterology and Hepatology Test Request (T728)
-Therapeutics Test Request (T831)