C-Peptide

• CPT Code: 84681
• LOINC: 1986-9
• Specimen Type: SERUM OR HEPARINIZED PLASMA
• Frequency: Setup: Tues, Fri; TAT 2-5 days
• Instructions: >0.5 mL serum from Red or SST. Specimen acceptable if refrigerated up to 48 hrs. Freeze if older than 48 hrs. Alt/plasma-green heparin tube.
• Text: Evaluate residual beta cell function in patients with diabetes mellitus treated with insulin; measure metabolic stability or brittleness of diabetes mellitus; useful in diagnosis of insulinoma.
• Methodology: Solid phase two site competitive chemiluminescent immunometric assay.