Prehospital blood transfusion has become a standard part of major trauma care across UK air ambulance services. All 21 UK air ambulance organisations now carry blood products, giving critical care teams the ability to start replacing lost blood at the roadside or in the air rather than waiting until hospital arrival.
For many NHS paramedics working alongside these teams, or in critical care roles, this represents one of the most significant advances in prehospital trauma management of the last decade. The focus has shifted from simply deciding whether to give blood products to refining how and when they are used.
The UK Picture
In the UK the practice is firmly established in air ambulance and specialist critical care teams. Services such as Dorset and Somerset Air Ambulance marked a decade of carrying blood in 2026, having delivered more than 450 transfusions since 2016. Crews report that the ability to start transfusion early has changed outcomes for patients with catastrophic bleeding who previously might not have survived the journey to hospital.
Most services carry a combination of red cells and plasma, with some now using or trialling whole blood. The SWiFT trial, led by NHS Blood and Transplant and involving multiple English air ambulance services, compared up to two units of whole blood with standard component therapy. It found no clear superiority for whole blood on the primary outcome of death or massive transfusion within 24 hours, but confirmed a similar safety profile and highlighted practical advantages such as simpler logistics and fewer bags to manage.
Earlier UK research, including the REPHILL trial, helped establish the role of prehospital blood products. You can find a useful summary of that trial and other major UK prehospital studies on the EMSUK Learning site: UK Prehospital Care Trials (Last 15–20 Years).
NICE guidance continues to support limited crystalloid use only when blood components are unavailable, with the emphasis on rapid haemorrhage control, tranexamic acid, and early blood products where indicated.
Ground-based NHS ambulance services still rarely carry blood products themselves. Most transfusions remain the domain of air ambulances and critical care paramedic or doctor teams. That may change gradually as evidence and logistics improve, but for now the majority of UK paramedics will encounter prehospital blood through joint working with HEMS or specialist response teams.
Around the World
Outside the UK the picture is more mixed. In the United States many ground EMS systems have started or expanded prehospital whole blood and component programmes in 2025 and 2026, particularly in rural areas and larger cities. Early observational data have shown lower mortality compared with crystalloid alone, though large randomised trials comparing whole blood with components have produced more neutral results on survival. Logistics, cold-chain management and blood supply partnerships remain the main practical challenges everywhere.
What This Means for NHS Paramedics
For frontline paramedics the key practical points are recognition, early decision-making and seamless handover. Patients who meet physiological triggers for haemorrhage (low blood pressure, raised shock index, clear major blood loss) benefit from the earliest possible involvement of a blood-carrying team. Good communication with air ambulance or critical care desks, accurate scene information, and maintaining temperature and haemorrhage control while waiting all matter.
The conversation has moved on from “should we give blood?” to “how do we give it most effectively?” Physiological targets, volume, timing and the role of whole blood versus components are the current research questions. UK services continue to refine protocols based on local audit and national trial data.
For more background on related UK prehospital research and clinical topics, visit the EMSUK Learning clinical news and resources section: EMSUK Learning.
“Before we carried blood components, many of us remember holding the hands of patients who sadly died on the way to hospital.” – Dr Phil Hyde, Medical Director, Dorset and Somerset Air Ambulance, reflecting on a decade of prehospital transfusion.
References
- All 21 UK air ambulances carry blood products: https://link.springer.com/article/10.1186/s13049-025-01428-w
- SWiFT trial summary and results context: https://www.medpagetoday.com/emergencymedicine/emergencymedicine/120349
- Dorset and Somerset Air Ambulance 10-year milestone: https://www.bbc.co.uk/news/articles/c33272p4preo
- NICE major trauma guidance (fluid and blood product recommendations): https://www.nice.org.uk/guidance/ng39/chapter/recommendations
- EMSUK Learning – UK Prehospital Care Trials (includes REPHILL): https://www.emsuklearning.co.uk/uk-prehospital-care-trials-last-15-20-years/
- EMSUK Learning homepage: https://www.emsuklearning.co.uk/
Quick Overview
- 10 minute read
- Intermediate level
- Updated 5 Oct 2026
Key Learning Points
- All 21 UK air ambulance services now carry blood products as standard for major trauma.
- Whole blood has practical advantages but has not shown clear superiority over components in the UK SWiFT trial for the primary survival outcome.
- Ground NHS ambulance crews rarely carry blood themselves; most prehospital transfusions are delivered by air ambulance or specialist critical care teams.
- Early recognition of life-threatening haemorrhage and rapid activation of a blood-capable resource remain essential.
- Crystalloids should be used sparingly and only when blood products are not immediately available.
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Self-reported reading. This does not complete a CPD reflection.