This error meant that some people got back the wrong gender, for instance, an error easily spotted. But one customer reports of what the mix up meant for him:
Still upset I checked family inheritance and noticed my daughter shared with me, and then I checked my son’s. He was not a match for any of us. I checked his haplogroup’s and they were different from ours. I started screaming. A month before my son was born two local hospitals had baby switches. I panicked and I checked over and over. My kid’s were sitting at the computer because we all wanted to see the results. My son laughed but he looked upset. I called my sister in tears.
23andMe in a blog post says the mix-up was caused “by human error and the incorrect placement of a single 96-well plate used in processing samples." They company claims they are “adding new procedures to prevent this from happening again.”
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