“Test Ideal level • fasting blood glucose less than 95 milligrams per deciliter (mg/dL) • fasting insulin below 8 µIU/ml (ideally, below 3) • hemoglobin A1C 4.8 to 5.4 percent • fructosamine 188 to 223 µmol/L • homocysteine 8µmol/L or… — David Perlmutter Copy Share Image