Table 2

Standardized CGM metrics for clinical care: 2019

1. Number of days CGM worn (recommend 14 days) (42,43)
2. Percentage of time CGM is active (recommend 70% of data from 14 days) (41,42)
3. Mean glucose
4. Glucose management indicator (GMI) (75)
5. Glycemic variability (%CV) target ≤36% (90)*
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
Use of Ambulatory Glucose Profile (AGP) for CGM report
  • CV, coefficient of variation.

  • *Some studies suggest that lower %CV targets (<33%) provide additional protection against hypoglycemia for those receiving insulin or sulfonylureas (45,90,91).