This skill saves lives and allows you to stop bleeding wounds and jury-rig critical injuries, allowing characters to continue fighting when they shouldn't. In the long-term however, major injuries require bed rest. A beginner will not only heal wounds more slowly, but will use up all their medkits really quickly.

–in-game description

Field Medic is a very important stat that directly influences a characters effectiveness at healing and the use of First Aid Kits and Splint Kits. It also determines how effective you are using the advanced types of these items.

Performing first aid or operating the Medical Workbench will level up a character's Field Medic stat.