Specimen Requirements
Collection
Patients taking calcineurin inhibitors should stop their medication for 72 hours prior to draw. Patients taking prednisone should be off their medication for 2 weeks prior to draw. Collect specimen in an SST or red top tube. Centrifuge and aliquot serum into a plastic vial within 2 hours of collection. Store at room temperature up to 1 week or freeze for longer storage.
Normal Volume
3 mL serum
Storage Temperature
Room temperature, refrigerated, or frozen specimens are acceptable.