Gender bloodwork

Sheena

Just curious: apparently I’m being told that the genetic/ gender blood work that can be done after 12 weeks gestation is sometimes wrong. Example: this lady’s results told her it was a girl & it ended up being a boy at delivery. This is news to me as I did the blood work with my first child and it was correct. Test: boy - Delivery: boy. I was under the impression that bloodwork with (example: Counsyl, Myriad, Natera), all reputable companies, had 99% accuracy per their websites. Anyone else ever have incorrect results from these tests? 🤔🤔🤔🤔