Glycemia is the concentration of glucose in the blood. It is usually expressed in milligrams per deciliter (mg/dl). It may be described as the concentration of sugar (glucose) in the blood. When persons with diabetes prick their fingers and get readings like 100 or 120 on their glucometers, they are measuring the level of glycemia. Glucose in blood is the primary source of energy for human beings and a healthy person's glycemia shall fluctuate within certain acceptable levels as indicated below: However, certain people or ethnic groups may be having slightly different normal levels of glycemia.