All things being equal medically, if a person is going to donate a kidney is there halachic or hashkafic reason to presume donating one kidney would be better than the other?
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(I assume in the ma'aseh that all things were equal medically).
Thanks for the above comments on medical preference. Just to extend that a bit -- even if there was zero medical preference on the kidney's utility for the recipient (which is likely incredibly rare), my next thought would be about the long-term health of the donor -- is s/he will only have one kidney, an injury to it would be life-threatening. Thus, on which side is a kidney likely to be better-protected from damage? (Probably ask a trauma surgeon what they see most often.)