Acceptable plasma blood glucose ranges for diabetics are between 70 and 130 milligrams per deciliter before meals and less than 180 mg/dL 1 to 2 hours after eating, states WebMD. These target ranges are only applicable to children with type 1 diabetes and non-pregnant adults with either type 1 or type 2 diabetes.
Optimal blood glucose ranges vary from one group of diabetic patients to another group. These ranges are influenced by age, diabetes type and an underlying medical condition.
Expectant mothers who are diagnosed with type 1 or type 2 diabetes are recommended to maintain a preprandial blood sugar range between 60 and 99 mg/dL and postprandial range between 100 and 129 mg/dL.
Adolescents ages 13 to 19 with type 1 diabetes should have a blood glucose range between 90 and 130 mg/dL prior to eating. A normal bedtime and overnight range is between 90 to 150 mg/dL, notes WebMD.