Using HbA1c: below 5.7% is normal, 5.7–6.4% indicates pre-diabetes, and 6.5% or above indicates type 2 diabetes on two separate tests. Using fasting glucose: below 100 mg/dL is normal, 100–125 mg/dL indicates pre-diabetes, and 126 mg/dL or above indicates diabetes. Pre-diabetes is highly reversible through dietary changes, exercise, and weight management — making early detection through regular testing genuinely actionable.