Test ID: CPEP
CPT code: 84681
LOINC: 1986-9
Specimen Type: SERUM OR HEPARINIZED PLASMA
Frequency: Setup: Tues, Fri; TAT 2-5 days
Instructions: >0.5 mL serum from Red or SST. Specimen acceptable if refrigerated up to 48 hrs. Freeze if older than 48 hrs. Alt/plasma-green heparin tube.
Text: Evaluate residual beta cell function in patients with diabetes mellitus treated with insulin; measure metabolic stability or brittleness of diabetes mellitus; useful in diagnosis of insulinoma.
Methodology: Solid phase two site competitive chemiluminescent immunometric assay.