Glucose measures the amount of sugar in your blood.  Glucose is the primary energy source in your body.  Insulin ( a natural hormone produced by the pancreas) controls how glucose is used in your body.  If the pancreas isn't producing enough insulin, the levels of glucose in your blood with rise.  High glocose levels can lead to kidney, eye, heart and nervous system diseases.  It can be an indication of diabetes or other glucose metabolism disorders.

The normal glucose range is 65 - 99 mg/dL