Most kidney stones produced

Donald Winfield of Caledonia, Ontario, Canada, produced and passed 5,704 kidney stones between 20 February 1986 and 14 September 2006. The stones range in size from that of a small clump of sand to the size of peas, and the most he ever passed in a 24-hour period was 22.

Donald passed away on 15 March 2015; in lieu of flowers at the funeral, his family requested donations be made to the Kidney Foundation of Canada.