Chart
The blood sugar chart
Fasting, normal is under 100 mg/dL (5.6 mmol/L). Two hours after the lab's glucose drink, it's under 140 (7.8). An A1c is normal under 5.7%. The lines are the same at every adult age, and only a lab test decides a band.
LowNormalPrediabetes rangeDiabetes range703.91005.61267.0
LowNormalPrediabetes rangeDiabetes range703.91407.820011.1
NormalPrediabetes rangeDiabetes range5.7%396.5%48
LowNo official band703.91407.818010.0
Healthy people on a sensor
Shah 2019 153 healthy, non-obese people aged 7 to 80
- In 70 to 140
- 96% of the day
- Above 140
- About 30 minutes a day
- Average
- 98 to 99 mg/dL, 104 over 60
Framingham 2025 560 adults with normal tests, mean age 58.5
- In 70 to 140
- 87% of the day
- Above 140
- About 3 hours a day
So a sensor going over 140 after a meal is ordinary. In the Framingham group, more than 15 minutes a day went above 180.
The bands
| Test | Normal | Prediabetes range | Diabetes range |
|---|---|---|---|
| Fasting | Under 100 mg/dL (5.6 mmol/L) | 100 to 125 (5.6 to 6.9) | 126 (7.0) or more |
| 2 hours after a glucose drink | Under 140 (7.8) | 140 to 199 (7.8 to 11.0) | 200 (11.1) or more |
| A1c | Under 5.7% (39 mmol/mol) | 5.7 to 6.4% (39 to 47) | 6.5% (48) or more |
| Any time | No band | No band | 200 or more with symptoms |
A diagnosis needs two abnormal results, from two tests or two days, unless the number is clearly high. Under 70 mg/dL (3.9) is low and under 54 (3.0) is seriously low. Pregnancy uses tighter numbers. To change units, divide mg/dL by 18.
Look up a number
Fasting
707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130135140145150155160165170175180185190195200
After eating
A1c
4.54.64.74.84.95.05.15.25.35.45.55.65.75.85.96.06.16.26.36.46.56.66.76.86.97.07.17.27.37.47.57.67.77.87.98.08.18.28.38.48.58.68.78.88.99.09.19.29.39.49.59.69.79.89.910.0
Normal Prediabetes range Diabetes range
4 sources
- American Diabetes Association, Standards of Care in Diabetes 2026, section 2, Tables 2.1 and 2.2pmc.ncbi.nlm.nih.gov
- American Diabetes Association, Standards of Care in Diabetes 2026, section 6, Table 6.4pmc.ncbi.nlm.nih.gov
- Shah VN and others, Continuous glucose monitoring profiles in healthy nondiabetic participants, Journal of Clinical Endocrinology and Metabolism, 2019pmc.ncbi.nlm.nih.gov
- Spartano and others, blinded sensors in the Framingham Heart Study, Journal of Clinical Endocrinology and Metabolism, 2025pubmed.ncbi.nlm.nih.gov
