When should a driver be disqualified due to an ejection fraction (EF) of less than 60%?

A driver should be disqualified due to an ejection fraction (EF) of less than 60% after a waiting period of 3 months. This waiting period allows for a proper assessment of the driver's condition and provides time to monitor whether their EF may improve or if other underlying health issues can be addressed. The 3-month interval serves to ensure that the driver's health is stable and that any potential functional limitations or risks associated with driving are evaluated adequately.

Immediate disqualification might be overly stringent for some individuals whose condition could stabilize or improve with time. Likewise, disqualification solely based on EF reading does not take into account that some individuals may be asymptomatic, meaning that they do not show any functional symptoms despite having a lower EF. Continuous monitoring and re-evaluation of the driver's health status during this waiting period is also essential for making an informed decision regarding their fitness to drive. Thus, option B aligns with a more balanced and medically sound approach in determining the driver's ability to operate a vehicle safely.