Test Code CPEPT C-Peptide, Serum
Performing Laboratory
MaineGeneral Medical Center
Specimen Requirements
Serum
Draw blood in a gold-top (serum separater) gel tube from a fasting patient. Label specimen with patient’s name (first and last), date of birth, date and time of draw and the phlebotomist’s initials.Spin down and send 1 ml of serum refrigerated.
Specimen stability:
8 hours at room temperature
24 hours refrigerated at 2-8°C
For longer storage freeze at ≤ -20°C
Minimum volume:
0.5 mL
Specimen rejection criteria:
Samples stored longer than 8 hours at room temperature will be rejected.
Day(s) Test Performed
Tuesday and Friday
Test Classification and CPT Coding
84681
Reference Values
0.8-3.9 ng/mL
Methodology
Chemiluminescent Immunoassay