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22475 C-Peptide

C-Peptide
Test Code: CPEP
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​Serum Separator Tube (SST)​Red Top Tube (RTT)​1.0 mL​0.5 mL​0.3 mL​
Collection Processing Instructions
Fasting sample - typically > or = 8 hours.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Ambient​ 2 hours​
Refrigerated​ 24 hours​
Frozen​ >24 Hours​
Rejection Criteria
​Grossly hemolyzed
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday2 hours
Two-step Sandwich Immunoassay using Direct Chemiluminometric Technology/Siemens Centaur
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)​
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
84681 ​
Synonyms/Keywords
C-Peptide​
Ordering Applications
Ordering Application Description
​Centricity ​C-Peptide
​Cerner ​C-Peptide
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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​Serum Separator Tube (SST)​Red Top Tube (RTT)​1.0 mL​0.5 mL​0.3 mL​
Collection Processing
Fasting sample - typically > or = 8 hours.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Ambient​ 2 hours​
Refrigerated​ 24 hours​
Frozen​ >24 Hours​
Rejection Criteria
​Grossly hemolyzed
Reference Range Information
Performing Location Reference Range
Marshfield​ 0.8 - 3.9 ng/mL (= ug/L)​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday2 hours
Two-step Sandwich Immunoassay using Direct Chemiluminometric Technology/Siemens Centaur
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
84681 ​
For most current information refer to the Marshfield Laboratory online reference manual.