The normal fasting blood glucose level for a healthy individual is generally between 70 and 100 mg/dL (3.9 to 5.6 mmol/L). Levels from 100 to 125 mg/dL (5.6 to 6.9 mmol/L) indicate prediabetes, where lifestyle changes and monitoring are recommended. A fasting glucose level of 126 mg/dL (7.0 mmol/L) or higher suggests diabetes

. For people with diabetes, the American Diabetes Association recommends aiming for fasting blood glucose levels below 130 mg/dL, with targets individualized based on age and health status. For most adults with diabetes, a fasting range of about 90 to 130 mg/dL is typical, while children and older adults may have slightly different goals

. In summary:

• Normal fasting glucose: 70–100 mg/dL (3.9–5.6 mmol/L)
• Prediabetes: 100–125 mg/dL (5.6–6.9 mmol/L)
• Diabetes: ≥126 mg/dL (≥7.0 mmol/L)
• Diabetes management target: generally <130 mg/dL fasting, individualized per patient