Not accurate at 6 weeks but accurate at 9. Two different results received. I would say that most studies (proper peer reviewed ones!) find that sex determination is fully reliable from 7 weeks- I imagine lots of women will be able to get an answer at 6 weeks too but there will always be some with low fetal fractions etc which means less fetal DNA, which could mean a Y chromosome is missed. Vanishing twin could also cause the result to be wrong. Also its done off LMP but if your ovulation is late then you would be too early if you tried at 6 weeks. I would also advise clinical vein draw as there is much less opportunity to contaminate a sample. Try FGIH or alphabiolabs if in the UK - they take vein draws and are incredibly accurate :)
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