A person with prediabetes has a fasting blood glucose level between 100 and 125 mg/dl. If the blood glucose level rises to 126 mg/dl or above, a person has diabetes.&quot; and &quot;•An A1C 5.6% or below is normal.In prediabetes, A1C levels range between 5.7%-6.4%.he American Diabetes Association recommends a fasting plasma glucose level of 90-130 mg/dL (5.0-7.2 mmol/L) and after meals less than 180 mg/dL (10 mmol/L). If your doctor feels that you are pre-diabetic it would be okay to check a fasting blood sugar at home once a week or so.