I've read the section on healing in Deathwatch several times, and I can't quite seem to get my head around it. It says you can only attempt to heal once per wound, but it doesn't really seem to clarify how that works. Does it mean I can only heal a character as many times as he's been hit? Or as many times as he has hit points? Do I have to somehow track how much damage was done per each hit, and only heal that amount? I'd appreciate it if someone gave me a rundown on exactly how the healing works under that system; we're completely lost here.
Generally, the healing section is poorly worded.
Ok, Humor aside... The wording of the medicae skill (p.102) is not well done.
I've interpreted it in DH and DW, based upon experience with WFRP 1E and 2E, to mean this:
When you are wounded, you can receive first aid once. If wounded again after receiving first aid, you can receive 1st aid again.
A more literal interpretation would be track each individual hit's damage as a separate number, and each hit can only be healed to 0. It's more work, and logic dictates that a given wound can only be healed to down to 0, tho it's not explicit in the rules that way.
Limit 1st aid to once per battle. Many GM's I've talked to do this, but it fails to match the rules.
Either is workable. Given the earlier editions, however, it's easiest to GM if you use method 1 or 3.
Some Critical hits also require first aid to stop bleeding. Some GM's allow a bleeding stop roll to heal a point of damage as well. Others don't; the wording on p.260 implies strongly that it's a 3rd application of Medicae, and not covered on p.102. I don't allow it to heal a wound as well.
As an option, if using option 1, you might allow adding degrees of success to the amount healed, while with Option 2, it would often be moot.
Note also, based upon collating pages 262 and 102:
Lightly Damaged: total damage taken (after armor and toughness reductions) is less than 2* Toughness Bonus. Heals 1 point of damage naturally per day, doubled if receiving (successful) medical attention. First aid heals medic's Int Bonus points.
Heavily Damaged: Total does not exceed wounds score. Heal naturally 1 point of damage per week. Medical attention doubles this. First aid heals 1 point.
Critical Hits: Total exceeds wounds score. No natural healing. With medical attention, heals 1 point per week. First aid heals 1 point.
Taken from the Deathwatch living eratta