LONDON: The British hospital treating Prince William’s pregnant wife Catherine admitted that it released her private medical details to hoax callers from an Australian radio station.

Presenters from Sydney’s 2Day FM station, posing as Queen Elizabeth II and William’s father Prince Charles, got through to a nurse at London’s private King Edward VII’s Hospital, where Kate is being treated for acute morning sickness.

The hospital confirmed that a nurse discussed Kate’s condition and said it “deeply regrets” the incident, which happened in the early hours of Tuesday, while the radio station has apologized.

The hoax is deeply embarrassing for the hospital, which has also treated the queen, her husband Prince Philip and Charles’ wife Camilla over the years. The queen is its patron.

“This was a foolish prank call that we all deplore,” said the hospital’s chief executive John Lofthouse. “We take patient confidentiality extremely seriously and we are now reviewing our telephone protocols.”

Lofthouse revealed the hospital was deciding whether to take legal action.

He added: “I’ve received advice that what the Australian broadcasters did may well have broken the law,” he said. “On the other hand they’ve apologized for it so we’re going to have a long and careful think about what, if anything, we do.”

2Day FM presenter Mel Greig, impersonating the 86-year-old monarch, dialled the hospital and asked the operator: “Could I please speak to Kate, please, my grand-daughter.”

The operator replied: “Oh yes, just hold on, Ma’am.”

The call was put on hold and Greig’s co-presenter Michael Christian asked incredulously: “Are they putting us through? If this has worked, it’s the easiest prank call we’ve ever made. Your accent sucked, by the way.”

Greig was put through to a ward where a nurse told her that Kate was “sleeping at the moment and she has had an uneventful night.”

The nurse added: “She’s been given some fluids to rehydrate her because she was quite dehydrated when she came in. But she’s stable at the moment.”

Greig replied, “Oh well, I’ll just feed my little corgis, then,” while two of her colleagues made barking noises in an impression of the queen’s corgi dogs.

“So, when is a good time to come and visit her?” Greig went on. “Because I’m the queen, so I need a lift down there.”

She then asked Christian, posing as 64-year-old Charles, when he could take her to the hospital.

The nurse suggested any time after 9:00 am, after Kate had “freshened up”.

“She hasn’t had any retching with me since I’ve been on duty and she has been sleeping on and off,” the nurse added.

2Day FM said it “sincerely apologizes” for any inconvenience caused by the prank.

A spokesman from William and Kate’s office at St James’s Palace declined to comment.