GSTM1 and diabetes mellitus: With such tools, a two-step procedure could be used: first, patients would be screened with a risk score; and second, those individuals identified to have a high risk for diabetes, would have their glycemic status assessed by measuring fasting plasma glucose (FPG), either alone or along with 2-hour post-load glucose (2hPG) using the oral glucose tolerance test (OGTT), or the more recently authorized hemoglobin (Hb)A1c measurement [2-4].