C Peptide

Overview

  • EPIC Code:
  • LAB521
  • Soft Test Code:
  • CPEP
Alternate Names
  • C-Peptide
Clinical Significance

C-Peptide is used in newly diagnosed Type 1 or Type 2 Diabetes to help determine the level of insulin the patient is producing. The results may also be used to distinguish insulin-secreting tumors from exogenous insulin. C-peptide measurements also can be used in conjunction with insulin and glucose levels to help diagnose the cause of documented hypoglycemia and to monitor its treatment.


Specimen Collection & Preparation

Patient Preparation

8 hours Fasting

Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn.


Specimen Requirements:

-OR-

1.0 mL Serum in a SST Gold Top Tube
Minimum Volume:
0.2 mL Serum*

* This volume does not allow for repeat testing

Processing Instructions:

Centrifuge and separate from cells within 48 hours


Transport and Storage:
  • Ambient (18-24°C): 4 Hours
  • Refrigerated (2-8°C): 24 Hours
  • Frozen (-20° C or colder): 30 Days

    Freeze only once

Clinical Interpretation

Reference Range:

0.9 - 5.0 ng/mL


Test Comments:

Patients taking vitamin supplements containing doses of >5 mg/day may have falsely decreased test results generated.


Methodology:
  • Chemiluminescence (CL)
Clinical Significance

C-Peptide is used in newly diagnosed Type 1 or Type 2 Diabetes to help determine the level of insulin the patient is producing. The results may also be used to distinguish insulin-secreting tumors from exogenous insulin. C-peptide measurements also can be used in conjunction with insulin and glucose levels to help diagnose the cause of documented hypoglycemia and to monitor its treatment.


Production Schedule

Sites Performed
  • Parkview Regional Medical Center
Days Performed
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Departments
  • Chemistry
Turn Around Time

Same Day/1 to 2 days


Coding & Compliance

CDM

00910359


CPT Coding

84681