Blood sugar Level at age of 15 .
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Understanding blood glucose level ranges can be a key part of diabetes self-management.
This page states ‘normal’ blood sugar ranges and blood sugar ranges for adults and children
Recommended blood glucose levels have a degree of interpretation for every individual and you should discuss this with your healthcare team.
The following ranges are guidelines provided by the National Institute for Clinical Excellence (NICE) but each individual’s target range should be agreed by their doctor or diabetic consultant.
NORMAL AND DIABETIC BLOOD SUGAR RANGES
For the majority of healthy individuals, normal blood sugar levels are as follows:
Between 4.0 to 5.4 mmol/L (72 to 99 mg/dL) when fasting 
Up to 7.8 mmol/L (140 mg/dL) 2 hours after eating
For people with diabetes, blood sugar level targets are as follows:
Before meals : 4 to 7 mmol/L for people with type 1 or type 2 diabetes
After meals : under 9 mmol/L for people with type 1 diabetes and under 8.5mmol/L for people with type 2 diabetes
BLOOD SUGAR LEVELS IN DIAGNOSING DIABETES
The following table lays out criteria for diagnoses of diabetes and prediabetes.
Blood sugar levels in diagnosing diabetesPlasma glucose
testNormalPrediabetesDiabetesRandomBelow 11.1 mmol/l Below 200 mg/dlN/A11.1 mmol/l or more 200 mg/dl or moreFastingBelow 5.5 mmol/l Below 100 mg/dl5.5 to 6.9 mmol/l 100 to 125 mg/dl7.0 mmol/l or more 126 mg/dl or more2 hour post-prandialBelow 7.8 mmol/l Below 140 mg/dl7.8 to 11.0 mmol/l 140 to 199 mg/dl11.1 mmol/l or more 200 mg/dl or more