O neg universal doner
Though I not a Jw, just wanted to interject it felt good to be givin the designation of being in the “gallon” club. I know I gave a lot of useful blood being o positive. I have naturally high iron levels so it is not difficult for me to give blood except when I become underweight, Then they mix me.
It does make a person feel good knowing you have given a life saving product from yourself.
I have donated blood in the past. Has been a while.