![]() ![]() So, I think my assumption for now is that the chance is greater than 50% that it’s a girl, but definitely less than 99%. My hunch is that the accuracy is most likely not actually 99% at 6 weeks and that not enough male DNA may be present that early on for some people. Based on the Amazon reviews, there appear to be far more false girl results than false boy results for the Snap test. In my group, we had a running poll on accuracy. Mine was accurate Said girl and now I have baby girl It was correct for me Boy And I’ve had NIPT and tons of ultrasounds to confirm. Of course there’s a possibility of contamination, but it seems much more difficult with the Snap test to contaminate. Said boy and we’re having a boy To be fair we’re a two female household. I see at least one Amazon review indicating that enough fetal DNA was present at 6 weeks, got a girl result, and repeated the test at 10 weeks and got a boy result. So I took another one at 6 weeks 5 days (based on the predicted gestation age by my doctor, based on the fetal pole) and it also says girl. However, according to my doctor, I must have ovulated late and I would have been just under 5 weeks when I took the test. The results indicated sufficient fetal DNA detected and came back a girl. I took a test at what I thought was about 6 weeks 3 days. However, in looking at recent Amazon reviews, 9 (but out of 503) reviews indicate false girl results with the Snap test. ![]() In reviewing Sneak Peak’s self-reported data about the testing done to confirm accuracy at 6 weeks, it seems extremely accurate (on it’s face). Do it for fun, but ymmv.I’m also trying to grapple with the true accuracy of the test. TLDR: the science works, but this company's methodology may not be robust. As a scientist in this field, I can say that performing a test such as this by mail order is much more complicated than if a patient were to come to a testing facility/lab and give a sample under controlled circumstances. So while the science is absolutely sound, this company's execution of the science seems slightly suspect to me. Looking at their website, they do a somewhat poor job of describing their method of testing and their system of controls. Then i again washed my hands with soap and water for a minute before using the test. Next I scrubbed the area (my kitchen table) with a soap and a new unopened sponge first. They would also describe a limit of detection or a lower limit of resolution for the test. First washed my hands for 30 seconds with soap and water up to my elbows. There are no other males in my house that could’ve skewed the test. He wasn’t even home when I took the test. I followed all the instructions to the T. Now a robust test and a reputable lab would have a multitude of controls that would be processed alongside the sample to prevent situations such as these. The company said that they were 99.1 accurate with their tests. Even something as simple as the package getting left in the sun and all the reagents getting too hot can negatively impact the test. Wrong ratio of blood to sample/lysis buffer? The DNases present in blood will degrade the DNA over time and your sample will be negative. SneakPeek Clinical Early Fetal Sex DNA Test: A Gender Blood Test at a Doctor's Office Near You SneakPeek Clinical lets you learn your baby’s gender as soon as the next day. There is too little fetal DNA in your sample to be amplified and detected? They don't find a Y and assume you are having a girl. ![]() They falsely tell you that you have having a boy. Your husband touches the tube? Possible Y contamination. Gender testing specifically is prone to contamination. There are many more variables that can be introduced and therefore lead to potentially inaccurate results. That being said, there is a lot of room for error by sending a patient an at home test. They are specifically working to detect the Y chromosome- if they detect a Y, you are having a boy and if they do not detect a Y, you are having a girl, since as a woman you have 2 X chromosomes. It works by isolating and amplifying the fetal DNA, so it can be detected. It works by detected the free fetal DNA which is circulating in the mother's blood. I'm a scientist who works in molecular diagnostics. ![]()
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