Q. A brother wanted to know if it was permissible to give blood to blood banks so they can have a store just in case they need it?
A. Donating blood to another person is only allowed in the case of a necessity that requires it. Simply storing blood in the blood bank is not sufficient as a need for a Muslim to give blood to the blood bank. Hence, it is not permissible for a Muslim to donate his blood to the bank to be stored up.
And Allah knows best.
Mufti Waseem Khan
This answer was collected from DarulUloomTT.net, which is operated under the supervision of Mufti Waseem Khan from Darul Uloom Trinidad and Tobago.