Inclusion Criteria:  Have been diagnosed with type 1 or 2 diabetes Be 25 - 65 years of age Male or female Various ethnicities are desired Must be available for 2 visits within a 2-4 week period and willing to spend up to 1-2 hours/visit Must have daytime availability for visits Able to have 1 venous blood draw & up to 4 fingersticks for complete blood testing at each visit Must be willing and able to fast (for at least 6 hours) prior to first visit  Exclusion Criteria:  Taking drugs of abuse (illegal and/or prescription) Have been in another research study in the last 30 days Have had a blood transfusion or severe blood loss in the last 14 days Have Sickle Cell Anemia