After my first hypothetical question, I felt that what if the situation was switched. What if (Allah la ye2adar) you were the one needing a transplant. Could you accept a kidney from a loved one, knowing that the organ might get rejected? You could be jeapordizing their health too? You would need lots of medical attention for the rest of your life?
You know, somehow I expect that to happen even without asking
Well you could choose not to tell them that you needed one
.
I would not ask, but if they offered I would consider it.