[bsimpson]

This is precisely why I've never been interested in being an organ donor.

I don't remember where specifically I learned this, but I was taught that tissue has to be alive to be useful, so they harvest it when you're almost-dead. Having my last moments be being literally dismembered is not something I wish for my future self.

[scratchyone]

They will never remove tissue if you're still alive. This is the reason organ donation is most common in brain-death cases, because the tissue is still alive but you are entirely dead. As you point out, it would be horrible to dismember someone who is still alive and would certainly violate their oath.

I hope this is a comforting answer, I choose to be an organ donor because of these details.