Utah State University is investigating the facts that a woman at Salt Lake City clinic was artificially inseminated with the sperm of laboratory employee and not her husband, Newsmax Health reports.

The school released a statement saying no records remained at the now-closed lab, Reproductive Medical Technologies Inc, to prove the woman's claim, and that the part-time employee died in 1999.

"Through genetic testing, a woman who received artificial insemination in 1991 discovered the biological father of her child was not her husband, as she had assumed," the university statement said. "She traced the genetics of her child to a man who was a former employee of a now-defunct medical lab, Reproductive Medical Technologies Inc."

The station did not disclose her name.

The woman, who was not shown on TV, told the station that she and her husband went to the lab in the early 1990s after they had trouble conceiving and that their daughter, who is now 21, was born in 1992.

The university said it had been unable to determine how the sperm could have been swapped, but said there was no evidence that any other couples were affected.