1In laboratory testing, SneakPeek accurately determined fetal sex in 99.1% of 108 pregnant women at 8 weeks gestational age. See the peer-reviewed study in the International Journal of Pregnancy and Childbirth (Int J Pregn & Chi Birth. 2019; 5(4):135-137). 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 Journal of Pregnancy and Child Health. (J Preg Child Health. 2017; 4:358).