I did. 2 Pints. Surgeon wanted 3, but after two donations in 3 weeks, was all I could stand.
This was my choice, surgeon felt positive about the blood supply. However, donating your own blood, according to my surgeon does reduct the risk of afibs, and might make it easier on the new valves not having to adjust to a new blood supply.
In the end, all I needed was the platelets due to the recycling of my own blood.
However, there is a down side to this. I think it takes your body about 60 days, or more to regenerate the blood lossed. Furthermore, I am advised that the blood is only good for 30 days. So not only will you be recovering from surgery, you will also be recovering from a loss of blood.
If you do this, takes lots, and I mean LOTS of iron, and the ever available stool softerners.
Best answer to this should also go to a GP/and or oncologist.
It was my oncologist that recomended I do this.