Table 6.2

Standardized continuous glucose monitoring (CGM) metrics for clinical care

1. Number of days CGM device is worn (recommend 14 days)

2. Percentage of time CGM device is active (recommend 70% of data from 14 days)

3. Mean glucose

4. Glucose management indicator (GMI)

5. Glycemic variability (%CV) target ≤36%*

6. Time above range (TAR): % of readings and time >250 mg/dL (>13.9 mmol/L)

Level 2

7. Time above range (TAR): % of readings and time 181–250 mg/dL (10.1–13.9 mmol/L)

Level 1

8. Time in range (TIR): % of readings and time 70–180 mg/dL (3.9–10.0 mmol/L)

In range

9. Time below range (TBR): % of readings and time 54–69 mg/dL (3.0–3.8 mmol/L)

Level 1

10. Time below range (TBR): % of readings and time <54 mg/dL (<3.0 mmol/L)

Level 2
  • CGM, continuous glucose monitoring; CV, coefficient of variation.

  • *Some studies suggest that lower %CV targets (<33%) provide additional protection against hypoglycemia for those receiving insulin or sulfonylureas. Adapted from Battelino et al. (17).