TABLE 6.2.

Standardized 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. GMI
5. Glycemic variability (%CV) target ≤36%*
6. TAR: % of readings and time >250 mg/dL (>13.9 mmol/L)	Level 2 hyperglycemia
7. TAR: % of readings and time 181–250 mg/dL (10.1–13.9 mmol/L)	Level 1 hyperglycemia
8. TIR: % of readings and time 70–180 mg/dL (3.9–10.0 mmol/L)	In range
9. TBR: % of readings and time 54–69 mg/dL (3.0–3.8 mmol/L)	Level 1 hypoglycemia
10. TBR: % of readings and time <54 mg/dL (<3.0 mmol/L)	Level 2 hypoglycemia

%CV, percentage coefficient of variation; TAR, time above range; TBR, time below range.

^*Some studies suggest that lower %CV targets (<33%) provide additional protection against hypoglycemia for those receiving insulin or sulfonylureas. Adapted from Battelino T, Danne T, Bergenstal RM, et al. Diabetes Care 2019;42:1593–1603.