The SneakPeek® Early Gender DNA Test Science

How Does SneakPeek Work?

While every person has her own DNA in her bloodstream, a pregnant woman’s bloodstream also contains DNA from her unborn child. SneakPeek looks for male chromosomes in a small sample of mom’s blood. If male chromosomes are found, that means baby is a boy. If none are found, baby is a girl. SneakPeek is 99.9% accurate at 8 weeks into pregnancy.¹

What is the SneakPeek Process?

At SneakPeek Labs, a test process called non-invasive prenatal testing (NIPT) is used to analyze cell-free fetal DNA. Starting with a small sample of blood from mom, plasma is separated from whole blood by centrifuge, and extracted cell-free fetal DNA (cffDNA) is analyzed for Y chromosomes, which are found only in males. The SneakPeek test is sensitive enough to find even a single Y chromosome, giving you confidence in your results.

Learn More

1. Blogpost: SneakPeek Early Gender DNA Test Proven to Be 99.9% Accurate
2. Blogpost: Urine vs. DNA-Based Gender Predictor Tests
3. Publications: SneakPeek Clinical Studies

¹In our most recent large-scale study, SneakPeek accurately determined fetal sex in 99.9% of 1,029 pregnant women between 7-37 weeks gestational age. In a separate laboratory study run in 2019, 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 from 2017, 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).
²Times shown are estimates based on the shipping method. Times may vary depending on your location.