It is a noble gesture to say you would like to donate an organ, but it is much more involved than that. The only way I would consider donating would be once I had no more need for it (as iin I have sufferred brain death) or if it was for a close family member whom I was known to be a viable match. There are many risks to the organ donor, including pain, death and possible failure of your remaining kidney. Think and research carefully before you commit to such a thing!