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HelpTest Code CPEP C-Peptide
Synonyms/Keywords
C-Peptide
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
|
Yes |
Serum/Plasma | Lithium Heparin Plasma Separator Tube (PST) | Lithium Heparin Green Top (GTT), EDTA Lavender Top Tube (LTT), Serum Separator Tube (SST). Red Top Tube (RTT) | 1.0 mL | 0.5 mL | 0.3 mL |
Collection/Processing Instructions
Fasting sample – typically ≥ 8 hours.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 1 day |
| Refrigerated | 2 days | |
| Frozen | 90 days |
Rejection Criteria
Gross hemolysis
Test Information
To convert to pmol/L, multiply ng/mL x 331.
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| Marshfield | 0.8 - 3.9 ng/mL (= ug/L) |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday, Wednesday, Friday | 2 hours | Immunoenzymatic assay/ Beckman Coulter DXI 800 |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84681 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84681 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | C-Peptide |