Is it permissible to donate blood and organs?

Donating blood is permissible in the event that the doctor describes that the donor is not harmed because this (the blood) is something that can be replaced. As for donating an organ, it is not permissible because this is an alteration and a loss that can not be replaced. Questioner: (Whether) alive or dead, Shaykh? Shaykh: (Whether) Alive or dead.