Which of the following blood sugar levels would disqualify a driver with diabetes?

A blood sugar level above 200 mg/dL is significant because it indicates hyperglycemia, which can result in serious health complications that affect a driver's ability to operate a commercial motor vehicle safely. According to guidelines for commercial drivers with diabetes, maintaining blood sugar levels within a certain range is crucial for ensuring that drivers are alert and can respond effectively while on the road. Levels exceeding 200 mg/dL suggest that the individual's diabetes may not be adequately controlled, increasing the risk of symptoms such as confusion, fatigue, or even loss of consciousness. This poses a danger not only to the driver but also to others on the road, which is why such a level would disqualify a driver from operating a commercial vehicle.

In contrast, levels below 100 mg/dL and levels between 100 and 140 mg/dL are typically considered to be within acceptable ranges for blood glucose control, while levels between 140 and 180 mg/dL indicate some control but may still warrant monitoring.