Standards of Care in Diabetes

The American Diabetes Association (ADA) annually updates its Standards of Care in Diabetes to provide clinicians with the most current evidence-based recommendations for the diagnosis and classification of diabetes. This document serves as a foundational resource for identifying diabetes across its various clinical presentations, including type 1, type 2, gestational, and monogenic forms, as well as pancreatic diabetes.

Diabetes is diagnosed using A1C, fasting plasma glucose (FPG), or 2-hour plasma glucose (2-h PG) during an oral glucose tolerance test (OGTT). While A1C is often preferred for routine screening due to its convenience and stability, the 2-h PG test is more sensitive at detecting diabetes and prediabetes. The guidelines emphasize that in the absence of clear hyperglycemic symptoms, a diagnosis must be confirmed through repeat testing. Furthermore, the document highlights the importance of recognizing that A1C may be unreliable in patients with conditions affecting red blood cell turnover, such as anemia, hemodialysis, or hemoglobinopathies, where plasma glucose criteria should be prioritized.

Classification is essential for personalized management, though the traditional boundaries between type 1 and type 2 diabetes are increasingly viewed as heterogeneous. The ADA recommends using clinical tools like the AABBCC approach (Age, Autoimmunity, Body habitus, Background, Control, and Comorbidities) to distinguish between types. For patients with atypical presentations, such as those diagnosed at a young age without classic type 2 risk factors, the guidelines suggest testing for islet autoantibodies or considering genetic testing for monogenic diabetes syndromes like MODY or neonatal diabetes.