There are various types used in the medical industry to test the sugar level of an individual. If you will use the Random blood sugar test then the average sugar level should not go beyond 140 mg/dl. The fasting blood sugar sets 70 to 100 mg/dl as the normal level ; the oral glucose tolerance test sets it at 140 mg/dl; and the A1C test sets it at 4 to 6 percent. Learn the difference between these tests by visiting http://www.livestrong.com/article/15891-what-average-blood-sugar-level/.
Virginia Mason Hospital (2011) lists a normal blood sugar level in the “low to mid 100s.” Symptoms of diabetes or heightened risk for diabetes is a blood sugar level of 200 or over, fatigue, weight loss, thirst, and frequent urination.