Blood Sugar Level Chart: What’s Normal, Low, and High?

Diabetes is defined as a disease in which the body has an impaired ability to either produce or respond to the hormone insulin. People with type 1 diabetes have a pancreas that does not make insulin. People with type 2 diabetes have cells in the body that are resistant to insulin or have a pancreas that slows or stops producing adequate insulin levels Both types of diabetes can result in abnormal glucose levels.

Normal blood levels may range slightly depending on what blood tests are used, but the variances are small. In addition, the “normal” ranges for non-diabetics are not the same for people with diabetes; it is generally accepted that target blood sugar measurements for people with diabetes will be slightly higher than for those without diabetes.

The normal ranges for blood sugar levels in adults who do not have diabetes while fasting are 72-99 mg/dL. These ranges may increase to 80-130 mg/dL for those being treated for diabetes.