A 15-year-old boy is brought to the Emergency Department after being stabbed in the buttock during an altercation. He is accompanied by his father. He is pale, has delayed capillary refill and is mumbling incoherently. You are the Emergency Medicine consultant leading the trauma team. You are concerned that he has life-threatening haemorrhage and explain to his father that he is likely to die without immediate blood transfusion. The anaesthetic consultant agrees with your assessment. His father states that both he and his son are Jehovah’s Witnesses and shows you a written note by the boy saying that he would not accept blood in an emergency.

What is the most appropriate immediate next step? Select only one best single option.