A Liverpool hospital is investigating claims that one of its fertility doctors offered to help a woman determine the sex of her baby.
Charles Kingsland is the clinical director of the reproductive centre at Liverpool Women's Hospital.
It is alleged he offered to put the woman in contact with a clinic in Cyprus, where couples can choose whether to have a boy or a girl.
The procedure is illegal under UK fertilisation law.
It is only permitted on the grounds of gender-linked diseases, such as haemophilia and muscular dystrophy.
The Mail on Sunday alleged Mr Kingsland advised an undercover reporter that he could arrange for them to fly to Northern Cyprus to undergo the procedure there.
Mr Kingsland declined to comment and there is no suggestion he has broken UK law.
The hospital said it would investigate to "establish the facts".
A spokeswoman for Liverpool Women's NHS Foundation Trust said: "Liverpool Women's NHS Foundation Trust does not support sex selection other than for those cases when it is allowed for genetic reasons.
"We are unable to comment further at this stage as the matter has only been brought to our attention over the weekend. We will be conducting an investigation to establish the facts."