C-Peptide : 372

Test Code

CPEPC or 372

Alias/See Also

C-Terminal Insulin

CPT Codes
84681

Instructions

Patient should fast 12 hours prior to collection.

Transport Container

Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL

Transport Temperature

Room temperature.

Specimen Stability

Room temperature: 4 days; Refrigerated: 7 days; Frozen: 7 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis; Plasma

Methodology
Immunoassay

Setup Schedule

Sunday - Saturday

Report Available

1 day

Reference Range

0.80-3.85 ng/mL

Clinical Significance

C-Peptide is useful in the evaluation of pancreatic beta cell function (e.g., helping distinguish type 1 from type 2 diabetes mellitus, or monitoring patients who have received islet cell or pancreatic transplants) and for determining the source of insulin in patients with hyperinsulinemic hypoglycemia (e.g., distinguishing insulin-secreting tumors from exogenous insulin administration). It is also sometimes measured as an additional means (more resistant to hemolysis than is insulin itself) for evaluating glucose tolerance tests.

Performing Laboratory
med fusion

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.