C PEPTIDE

Test Code

CPEPT

CPT Codes
84681

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

0.5 mL

Instructions

Centrifuge for complete separation of serum and red cells. Separate and refrigerate or freeze until tested.

Transport Temperature

Refrigerate or freeze

Specimen Stability

2-8°C up to 24 hours
Otherwise freeze

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

Improper storage temperature
Hemolysis >250 mg/dL hemoglobin

Methodology

Chemiluminescent Immunoassay

Setup Schedule

M, T, W, Th, F, Sa, Sun

Report Available

Within 24 hours of receipt at the performing laboratory.

Reference Range

0.81 - 3.85 ng/mL

Clinical Significance

C-peptide is useful in the evaluation of pancreatic function since it gives a direct evaluation of beta cell function in the pancreas. This test is useful in the management of diabetes and can differentiate Type 1 from Type 2 diabetes mellitus (DM).

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB3 (Chemistry, Centaur)

Last Updated: June 7, 2023

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.