<P> Since the molecular weight of glucose C H O is 180, the difference between the two units is a factor of 18, so that 1 mmol / L of glucose is equivalent to 18 mg / dL . </P> <P> Normal value ranges may vary slightly among different laboratories . Many factors affect a person's blood sugar level . The body's homeostatic mechanism of blood sugar regulation (known as glucose homeostasis), when operating normally, restores the blood sugar level to a narrow range of about 4.4 to 6.1 mmol / L (79 to 110 mg / dL) (as measured by a fasting blood glucose test). </P> <P> The normal blood glucose level (tested while fasting) for non-diabetics, should be between 3.9 and 5.5 mmol / L (70 to 100 mg / dL). The mean normal blood glucose level in humans is about 5.5 mmol / L (100 mg / dL); however, this level fluctuates throughout the day . Blood sugar levels for those without diabetes and who are not fasting should be below 6.9 mmol / L (125 mg / dL). The blood glucose target range for diabetics, according to the American Diabetes Association, should be 5.0--7.2 mmol / l (90--130 mg / dL) before meals, and less than 10 mmol / L (180 mg / dL) after meals (as measured by a blood glucose monitor). </P> <P> Despite widely variable intervals between meals or the occasional consumption of meals with a substantial carbohydrate load, human blood glucose levels tend to remain within the normal range . However, shortly after eating, the blood glucose level may rise, in non-diabetics, temporarily up to 7.8 mmol / L (140 mg / dL) or slightly more . For people with diabetes maintaining' tight diabetes control', the American Diabetes Association recommends a post-meal glucose level of less than 10 mmol / L (180 mg / dL) and a fasting plasma glucose of 3.9 to 7.2 mmol / L (70--130 mg / dL). </P>

What is d normal range of blood sugar