80% is what it is quoted and if u look in the pregly search engine and read results u will see that for about 80% of those who reported it worked and many who it didn't shook it instead of swirled
Well I did one with my first. Followed the instructions perfectly. It said boy, I had a girl. I was 15 weeks. My second, I took 2 at 20 weeks. Both said boy, again I followed the directions EXACT and I have a 6 week old girl. All it is, is a ph test and checks the acidic levels in your urine. Eating/drinking certain things will change your result. Its fun though!!
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