If no Y-chromosomes are found, mom is carrying a girl. Y-chromosomes would only be present if mom is pregnant with a boy. Using a small sample of mom’s blood, SneakPeek tests for the presence of male DNA (Y-chromosomes). For fraternal twins, finding male DNA means at least one baby is a boy, but cannot distinguish if the second is a boy or girl.ĭuring pregnancy, cell-free fetal DNA is released by the placenta and can be found in mom’s bloodstream. If no male DNA is found, then both babies are girls.

In the case of identical twins, if male DNA is found, then both babies are boys. SneakPeek looks for male DNA in the fetal DNA found in mom's blood sample. Can sneak peak determine the gender of each one? See the peer-reviewed study in the Journal of Pregnancy and Child Health. In a separate laboratory test, fetal sex was accurately determined in 99.6% of 241 pregnant women at 9 weeks gestational age and later into pregnancy. See the peer-reviewed study in the International Journal of Pregnancy and Childbirth (Int J Pregn & Chi Birth. In laboratory testing, SneakPeek accurately determined fetal sex in 99.1% of 108 pregnant women at 7 weeks gestational age. How accurate is the Sneak Peek early gender DNA test? Frequently Asked Questions about Sneak Peek Gender DNA Testing.

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