Fox News: A mother desperate to have a second child has told how she lost her last IVF embryo when the U.K. National Health Service implanted it into the wrong patient.

When the other woman found out that the embryo was not hers, she aborted it.

Details of the blunder raise fresh questions about the way IVF clinics are regulated.

The Sunday Times has previously revealed that women undergoing fertility treatment have had their eggs fertilized with the wrong sperm.

Deborah, the woman who lost her chance of another baby, is so traumatized by the error that she is reluctant to risk further IVF to have a longed-for sibling for her son, Jamie, 6.

Because Deborah is 40 her prospects of having another child with her boyfriend, Paul, 38, are slim and diminishing.

Deborah, who does not want to disclose her surname, said: "I will never forget the moment the hospital broke the news to us. Initially, the hospital told me there had been an accident in the lab and that the embryo had been damaged. I thought that someone had, perhaps, dropped the embryo dish.

"I remember thinking: 'That's our last hope gone - we will never have another child.' I left the hospital feeling totally shell-shocked.

"When we went back to the hospital two days later and we were told the truth about my embryo being given to someone else I was so angry."