Table 1. Differences in glycated hemoglobin values between Japan Diabetes Society and National Glycohemoglobin Standardization Program for assessments of diagnosis and treatment of diabetes mellitus (a) Diagnostic reference values of HbA1c (NGSP) and HbA1c (JDS).
| Diagnostic reference values | HbA1c (NGSP) | HbA1c (JDS) |
|---|---|---|
| Standard range (%) | 4.6–6.2 | 4.3–5.8 |
| Diabetes range (%) | ≥6.5 | ≥6.1 |
| Possible diabetes range (%) | 6.0–6.4 | 5.6–6.0 |
| High risk range for diabetes (%) | 5.6–5.9 | 5.2–5.5 |
| (b) Assessments of the glycemic control using HbA1c | ||
|---|---|---|
| Assessment of control state | HbA1c (NGSP) | HbA1c (JDS) |
| Excellent (%) | <6.2 | <5.8 |
| Good (%) | 6.2–6.8 | 5.8–6.4 |
| Fair | ||
| Inadequate (%) | 6.9–7.3 | 6.5–6.9 |
| Not good (%) | 7.4–8.3 | 7.0–7.9 |
| Poor (%) | ≥8.4 | ≥8.0 |
HbA1c, glycated hemoglobin; JDS, Japan Diabetes Society; NGSP, National Glycohemoglobin Standardization Program.