Ultimately, for the utilitarian the reason to hit the switch was to save 5 lives over 1 person’s demise. The surgeon situation is basically a similar one to the trolley example. Yes, the healthy person is forced to give up his organs and to die. However, 5 people are saved at the cost of 1. The utilitarian approach does seem to condone the doctor to kill that healthy patient.
However, one might say that the situations are different. In the trolley example, both parties are tied to the rails. In the surgeon’s case, 5 people are in danger, but the other is perfectly fine and healthy. Therefore, they argue that the utilitarian approach does not accept the surgeon to kill the healthy patient because he is not facing death or any other problems.