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Lesson

Prehospital Blood Transfusion

12 min Trauma Skip to quiz

Objective: Give prehospital blood only if your service carries it, and only for life-threatening bleeding with shock. Low-titer group O whole blood is the preferred product when a program has it. Blood does not replace a tourniquet or a short scene.

Why this matters

Most ambulances do not carry blood. The systems that do sometimes give it late, after a liter of saline, or instead of a tourniquet. NAEMSP 2025 teaching is specific. In a system that can support a quality program, use blood products instead of crystalloid for life-threatening traumatic bleeding. Low-titer group O whole blood is the first choice when the program has it.

First, stop bleeding you can compress. Then decide whether the patient has life-threatening bleeding with shock. Check that your service actually carries blood. Do not delay hemorrhage control or transport to start a unit. If you do not carry blood, limit crystalloid and move to a trauma center. Do not invent a blood product your service does not carry.

Key points
  • Control bleeding first. MARCH is massive hemorrhage, airway, respirations, circulation, then hypothermia and head injury. Use a tourniquet, packing, or direct pressure that actually holds. Blood running into an artery that is still bleeding does not fix the wound. Use a pelvic binder only if your protocol still uses one.
  • The indication is the vital signs plus the injury pattern. That means low blood pressure, a high shock index, or obvious massive blood loss. A high shock index is a heart rate that is high for the blood pressure. Pale skin alone is not the order.
  • Watch for a transfusion reaction. Hand off the product, the time, the volume, and any reaction. Warm the product if your system warms it.
Verbalize
  • Bleeding is controlled. Then I will give blood, if we carry it.
  • The indication is shock plus the injury pattern.
  • I will use whole blood if that is the program product.
  • A unit of blood does not replace a tourniquet.

Clinical sequence

  1. Stop bleeding you can compress. Open the airway. Support breathing. Then open the cooler, if you have one.
  2. Get access that will actually flow, such as a large intravenous line or a humeral intraosseous line. Tranexamic acid, called TXA, is not a substitute for blood. Give it only in the window your protocol allows: after bleeding control, with clinical shock, and within 3 hours. This site does not list a milligram dose.
  3. Transfuse per protocol and reassess. Do not chase a normal blood pressure in penetrating torso trauma. Damage-control resuscitation still applies.
  4. Go to a trauma center. What you do with unused product is a system rule. Do not start a unit only because you are almost at the hospital, unless protocol gives you a reason.

Teaching points

  • Blood over crystalloid for life-threatening traumatic bleeding when a program exists. A large saline infusion worsens coagulopathy. Coagulopathy means the blood does not clot normally.
  • Low-titer group O whole blood first when it is available. Component therapy is the second choice. Carrying components is not a reason to give nothing if that is what you have.
  • No blood on the ambulance still means limited crystalloid, TXA if it is indicated, and a fast trauma center. See damage-control resuscitation.
  • Vasopressors for hemorrhagic trauma are not the NAEMSP recommendation. A vasopressor does not replace the blood that was lost, and it does not replace hemorrhage control.

Common errors

  • Starting a unit of blood while the femoral artery is still bleeding.
  • Giving a liter of saline first to see if the patient improves.
  • Giving push-dose epinephrine for hemorrhagic shock only because the blood pressure was low.

Practice

One-minute check

A gunshot wound to the thigh has a tourniquet on, and the blood pressure is 72. Your ambulance carries low-titer group O whole blood. Say the order of actions. Then remove the blood from the scenario. Say what still happens, and what does not.

Related: Damage-Control Resuscitation, Tranexamic Acid in Trauma.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Questions drawn only from this lesson. After you check, the key is highlighted. Education practice — not a certification exam.

1. If your EMS system carries blood for trauma, NAEMSP prefers:
2. If the ambulance carries blood, it still comes after:
3. If you do not carry blood, the still-correct plan is:
4. Vasopressors for traumatic hemorrhagic shock in the field:
← Anticoagulated Trauma Compartment Syndrome in the Field →