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HelpTest Code CPEP C-Peptide
Laboratory Code
LAB521
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Fast patient 10 - 12 hrs before sample collection. Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 24 hours |
| Refrigerate | 48 hours |
| Frozen | 3 months |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
| Age | |
|---|---|
| 0 – < 1 yr | 70 – 1,448 pmol/L |
| 1 – 5 yrs | 116 – 1,477 pmol/L |
| 6 – 18 yrs | 257 – 2,241 pmol/L |
| ≥ 19 yrs | 260 – 1,729 pmol/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Evaluation of B-cell function in insulin dependent diabetes.
Aids in differential diagnosis of hypoglycaemia (factitious hypoglycaemia, insulin autoimmune hypoglycaemia and insulinoma).
Service Code
31869
LOINC Code Information
14633-2
Update
Last updated 10/03/2025