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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