Blood transfusionOverview

A blood transfusion is when you're given blood from someone else (a donor). It's a very safe procedure that can be life-saving.

Why it's done

Some of the main reasons for needing a blood transfusion are:

A blood transfusion can replace blood you've lost, or just replace the liquid or cells found in blood (such as red blood cells, plasma or cells called platelets).


What happens


A sample of your blood will also be taken to check your blood group. You'll only be given blood that's safe for someone with your blood group.

During a blood transfusion:

  4. The blood runs through the tube into your vein.


You can normally go home soon after, unless you are seriously unwell or needed a lot of blood.

How you might feel during and after

You might feel a sharp prick when the needle is first inserted into your vein, but you shouldn't feel anything during the transfusion.






Blood transfusions are common and very safe procedures.

All donor blood is checked before it's used to make sure it doesn't contain serious infections such as hepatitis or HIV.

There is a very small risk of complications such as:

  • an allergic reaction to the donor blood

The risks will be explained before having a transfusion, unless this isn't possible – for example, if you need an emergency transfusion. Speak to your doctor or nurse if you have any concerns.


A blood transfusion will only be recommended if it's needed and other treatments won't help.

If it's possible that you'll need a transfusion – for example, if you're due to have surgery or you have anaemia – you may sometimes be given medicine to:

  • lower your risk of bleeding, such as tranexamic acid

These can reduce your chances of needing a blood transfusion.

Giving blood afterwards

Currently, you can't give blood if you've had a blood transfusion.



Page last reviewed: 11/01/2018
Next review due: 11/01/2021