Up to 26 women may have been impregnated with embryos that were mixed with the wrong sperm during an “error” at an IVF clinic in the Netherlands.

The University Medical Centre Utrecht said they found that a “procedural error” between mid-April 2015 and mid-November 2016 might have matched up the wrong sperm and eggs.

“During fertilisation, sperm cells from one treatment couple may have ended up with the egg cells of 26 other couples. Therefore there’s a chance that the egg cells have been fertilised by sperm other than that of the intended father,” the clinic said in a statement.

While it’s a small chance the mistake occurred, the possibility “could not be excluded.”

The clinic also reported that half of the women who went through with the fertility treatment during that time became pregnant or had already given birth.


However, there was a chance that some of the 26 couples’ frozen embryos, which were still available, could also be compromised by having been “fertilised by the sperm from a man other than the intended father.”

The clinic said that all couples had been informed of the error and would  “do everything within its powers to give clarity on the issue as soon as possible.”

Ooof. What a nightmare.

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