Which of the following conditions is NOT on the list of disqualifying factors for diabetes certification?

Normal blood glucose levels are not considered a disqualifying factor for diabetes certification because they indicate that a person has good glycemic control. In a diabetes certification context, the focus is on whether the individual's diabetes is well-managed; normal blood glucose levels suggest that the condition is under control and that there is a low risk of complications associated with diabetes while operating a commercial vehicle.

In contrast, loss of pedal sensation and proliferative retinopathy are serious complications associated with uncontrolled diabetes that can impair the ability to drive safely. These health issues can significantly affect a person's motor functions and visual capabilities, potentially leading to hazardous driving situations. Resting tachycardia can also raise concerns for a medical examiner as it might indicate an underlying cardiovascular issue, which, alongside other symptoms, could pose risks while driving. Thus, having normal blood glucose levels is reassuring and indicative of a lower risk for complications related to diabetes in the context of medical certification.