For life-threatening blood loss, the use of unmatched, type-specific blood is preferred over type O blood unless multiple, unidentified casualties are being treated simultaneously.

• 对于威胁生命的失血，除非是在同一时间处理大量伤员且一时未及血型鉴定的情况下可用O型血代替，否则都应首选配型血液治疗。