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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 
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 
*

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

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