Diagnostic Testing Medical

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

Arbor Diagnostics