Yes, the National Kidney Foundation suggests that anyone with only one kidney (whether because of donation or because of removal of a diseased kidney) wear some sort of alert bracelet or medal. Especially important if one is taken unconscious to a hospital in an emergency, without a close relative present. Some of the contrast dyes that might be injected in order to scan for blockages in the blood vessels of brain or heart can be toxic to the kidneys, and dosage has to be adjusted for persons with one kidney. Also, remind your family to make sure the hospital knows.
I myself think that "left kidney donated" might be the clearest. It lets the staff know that the kidney is missing, but not because of disease. "donor" might be misinterpreted as willingness TO donate?
The National Kidney Foundation offers bracelets/medals and you can put a couple of lines of information of your choice. I included the phone contact of the person authorized in my "living will" to make medical decisions for me if I am unable. I also included my religion, as some hospitals consider it illegal to notify a chaplain unless the patient has chosen to reveal his/her religious denomination. I tossed in my blood type just in case. Some local chapters of the Kidney Foundation offer these for free, while other chapters charge a small fee. Find your local chapter at
www.kidney.org There is a previous thread on this topic that perhaps someone can find and "bounce" up, where others have shared their choices of different sorts of alerts. But it IS prudent to wear some sort of alert.
best wishes,
Fr. Pat