This is a skill for characters who take the Medic Pathway.
The Surgery skill is to treat more severe injuries; internal bleeding, collapsed lung, etc. This skill can raise a character’s hits from negative numbers to 0; so -2 to -1, or -1 to 0. The skill requires a minimum of 5 minutes of role-play per hit, after which a bead is pulled from a bag in the presence of a ref.