First aid
First aid is the skill of the simple treatment of wounds. With first aid one can apply bandages, splint broken bones and perform the most simple surgeries (extracting a bullet from an upper arm, for example), however those can easily go awry.
Bonuses would be applicable – like with the doctor skill – for experience and fitting equipment. If a character uses first aid for an operation that operation is especially handicapped.
The starting value is: 30 + P + I
Details to help distinguish between Doctor and First aid can be found here.