A man had a healthy kidney removed in error in an operation at Ayr Hospital.
Staff at Ayr Hospital are now planning Mr Heron's future care
John Heron, who is believed to be in his 60s and from Lugton, was admitted to have a diseased kidney removed.
In a statement Mr Heron's family said: "We are devastated by the disastrous professional errors that should never have happened."
NHS Ayrshire and Arran confirmed the mistake with "deep regret" and said it has apologised to the patient and his family for "this tragic error".
Health officials refused to discuss details of future treatment and whether or not Mr Heron would require dialysis.
In their statement, his family said: "We want to ensure that everything is now focused upon providing the best medical experience and care.
"We want to be sure that no other family experiences this in the future."
Dr Bob Masterton, Executive Medical Director with NHS Ayrshire and Arran, said staff were planning "the best possible medical care for Mr Heron in the future".
Scottish National Party MSP Alex Neil criticised the health board for failing to name the surgeon responsible for the error.
He said: "If I'm going in for a kidney operation in Ayr Hospital, and this surgeon is doing the operation, I want to know if this is the surgeon who made this blunder.
"Because if it is I wouldn't have the operation."