When are completed medical examinations due?

The correct answer is that completed medical examinations are due by midnight on the same date they are performed. This timeframe is significant because it ensures that all medical examinations are documented and submitted promptly. The FMCSA requires that medical examiners complete and submit necessary documentation on the same day the examination takes place to maintain accurate and up-to-date records regarding driver health status. Timely submission is critical as it helps in avoiding any lapses in compliance that could affect a driver's ability to operate a commercial motor vehicle safely.

The other options do not align with FMCSA guidelines, as there is no allowance for a week's delay, a 48-hour window, or deferring submission until the beginning of the following month. All these alternatives potentially lead to compliance issues and contradict the requirement for immediate documentation and reporting.