Díaz Lab Testing Store › C-Peptide | C-Peptide | $67.00 Measures pancreatic insulin production — differentiates Type 1 from Type 2 diabetes and evaluates beta cell function. Add To Cart Added! Measures pancreatic insulin production — differentiates Type 1 from Type 2 diabetes and evaluates beta cell function. Add-on: Integrative-Functional Lab Interpretation Report with Recommendations by Adalys Díaz $77.00 Add Added!