Some women, children and young people coming into hospital might need to have a blood transfusion as part of their operation or treatment.
Your doctor or nurse will talk to you about this at your outpatient appointment, pre-admission clinic visit or during your stay in hospital.
They will help you to understand the reasons why you might need a blood transfusion and what happens when you have a transfusion. They will also be able to answer any more questions you or your family might have.
Visit the links on the NHS Blood and Transplant website below to learn more about blood and blood transfusions.