Stay In The Fight
If you are stable and have enough Resolve Points, or if you were knocked unconscious from nonlethal damage (see page 252), you can spend 1 RP at the beginning of your turn to regain 1 HP. You are no longer dying, immediately become conscious, and can take the rest of your turn as normal. You can spend Resolve Points to regain Hit Points only if you are at 0 HP and stable, and you cannot regain more than 1 HP in this way. You can’t spend Resolve Points to stabilize and to stay in the fight in the same round.
Source
Core Rulebook pg. 251