Organ Donation

Yes it can be. Also for all the gray areas, we can always check with an aalim.

But you know what Muzna, I am going to share a secret with you :D. In Islam, Heela (arabic word) is allowed and heela literally means finding loop holes with in the boundary of shariat. Islam is not there to let people die or live low quality life. It allows you to take advantage of all the advancement of medical science. Do it when ever you can. Just check with an aalim to be sure.