My way of thinking is, the flight is planned and conducted in accordance with the applicable flight rules, irrespective of any medical opinion.
Well of course but why not then obtain a medical opinion if it is available. I am talking about SAR here and not simply flying from one hospital to the next. If I am being asked to winch an injured crewman off the back of a fishing vessel 100nm offshore at night in a force 7 and the doctor tells me that it can wait until morning then I will happily wait.