Understanding Normal Blood Sugar Levels: Ranges & Diabetes

Normal blood sugar range

- Fasting: 70 to 99 mg/dL (3.9 to 5.5 mmol/L)

- Postprandial: Less than 140 mg/dL (7.8 mmol/L)

Prediabetes

1. Fasting: 100 to 125 mg/dL (5.6 to 6.9 mmol/L)

2. Postprandial: 140 to 199 mg/dL (7.8 to 11.0 mmol/L)

Diabetes

- Fasting: 126 mg/dL (7.0 mmol/L) or higher

- Postprandial: 200 mg/dL (11.1 mmol/L) or higher

- Random: 200 mg/dL (11.1 mmol/L) or higher