- HbA1c levels between 6.5 and 9.0 (inclusive) where the upper limit of normal for the HbA1c assay is 6.4% or 6.2-9.0% (inclusive) where the upper limit of normal for the HbA1c assay is 6.1% and fasting plasma glucose between 110 and 240 mg/dL (inclusive) while on diabetic medications.