C‑Peptide Response to Glucose, 4 Specimens
Use
C‑Peptide measurement during a glucose challenge is useful for assessing pancreatic beta‑cell function—distinguishing type 1 from type 2 diabetes mellitus, evaluating insulin‑secreting tumors versus exogenous insulin administration, and during glucose tolerance testing; C‑peptide is also more resistant to hemolysis than insulin and thus often preferred during GTT evaluation.
Special Instructions
Not provided.
Limitations
Not provided.
Methodology
Immunoassay (Other)
Biomarkers
Result Turnaround Time
1-2 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL per specimen
Minimum Volume
0.5 mL per specimen
Container
Transport tube(s)
Collection Instructions
Draw fasting specimen. Administer oral glucose solution (1.75 g/kg or 75 g max). Collect 1 mL serum for each timed specimen post‑glucose dose. Tubes must be clearly marked with time drawn.
Patient Preparation
Patients should fast 12 hours prior to collection
Causes for Rejection
Gross hemolysis; Plasma
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 4 days |
| Refrigerated | 7 days |
| Frozen | 7 days (–20 °C); Not available (–70 °C) |