Test name: C-Peptide
Order Code: C-PEPTID
Preferred Specimen: 2mL serum in a Serum Separator Tube (SST or Tiger-top)
CPT Code: 84681
Collection: Allow SST to clot in an upright position for 60 min, then centrifuge sample within 2 hours of collection. Transfer serum to a plactic transport tube. Freeze.
Special Instructions and Considerations: Samples should not be taken from patients receiving therapy with high biotin doses (i.e. > 5mg/day) until at least 8 hours following the last biotin administration.
Transport Temperature: Refrigerated
Specimen Stability: 4 hours under room temperature; 2 days refrigerated