Thames Valley Air Ambulance has made an urgent plea for O negative blood donors.
This comes after NHS Blood and Transplant warned of a national shortage of this universal blood type, putting the air ambulance's ability to carry blood on board all its vehicles.
Adam Panter, chief operating officer at Thames Valley Air Ambulance, said: "When someone is bleeding heavily and time is of the essence, our crew can give them the blood they so desperately need, right at the scene.
"Last year, we gave blood to 96 critically ill or injured patients across the community we serve.
"That's almost two patients a week.
"But we can't perform this lifesaving intervention without those who donate blood in the first place."
To book an appointment to donate blood, visit the NHS Blood Donation website.
For more information on supporting the air ambulance, visit the Thames Valley Air Ambulance website.
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