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When you attempt a Medicine check to stop bleed damage or administer first aid to a dying creature, you can choose not to roll your expertise die in order to also automatically treat deadly wounds on that creature if your Medicine check is successful. The DC for the check is based on the medical equipment used, using the DC for treat deadly wounds + 5. This does not count as the treat deadly wounds treatment for the purposes of how many times per day a creature can receive this treatment, though a creature can only benefit from battlefield medic once per day. If you also have the surgeon expertise talent, you can increase the DC of a battlefield medic-related Medicine check by a total of 10 to use battlefield medic to treat deadly wounds on a creature one additional time per day (which does not count as a use of the surgeon expertise talent).