Low Blood Sugar and Passing Out

A: Low blood glucose is defined as a blood glucose level below 72 mg/dl. When it comes to low blood glucose reactions, everyone has a different threshold. In fact, at the same glucose levels, an individual may react very differently at different times. Some people will notice typical early warning symptoms such as feeling shaky, dizzy, weak, sweaty, or lack of coordination almost immediately, while other may have no symptoms at all. The glucose number which causes unconsciousness will vary greatly from one individual to another. Therefore, it is important to treat any blood glucose level below 72 mg/dl with a quick-acting carbohydrate and recheck glucose levels every 15 minutes until levels return to normal.