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.

Why is SneakPeek Gender more accurate now?
Why do I need to wait until 8 weeks, when there are 7-week women in the study?
What if I can’t hear my baby’s heartbeat?
Is it safe to use a Fetal Doppler?
How does a Fetal Doppler work?
I used last menstrual period (LMP) to calculate 8 weeks into pregnancy. Are my test results reliable?
Can I purchase SneakPeek early and take it when I’m at 8 weeks?
Is COVID-19 impacting SneakPeek shipping or results timelines?
In light of COVID-19, is SneakPeek Labs still accepting return samples?
Are SneakPeek products safe from COVID-19?
Why has the results email changed to show a check mark instead of a percentage?
What is the difference between SneakPeek At-Home and SneakPeek Clinical?
My blood sample was taken at a participating location. What is the status of my results?
How do I activate my SneakPeek At-Home test kit?
Can I buy the SneakPeek test kit now and use it later?
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Is SneakPeek a pregnancy test?
Does taking progesterone or other hormones affect my results?
Do blood thinners affect my results?
Is shipping free?
Do you ship to APO/FPO/DPO addresses?
I’ve seen gender predictor tests that use urine samples. How is SneakPeek different?
Can I take the SneakPeek Test if I’m breastfeeding?
Do hormone disorders such as PCOS affect my results?
How is my privacy protected?
Is the test safe?
How quickly will I receive my refund?
When is SneakPeek Customer Care available?
What do I do if I have a question about my order?
I’m having twins. Can SneakPeek determine the gender of each one?
What is SneakPeek’s guarantee?
I’ve previously had a boy. Will that affect my test result?
Does a previous miscarriage affect my test results?
How do I ensure an accurate test result?
I can’t find my results email, what do I do?
When will I receive my results?
How are my results given to me?
How will I know you received my sample?
I don’t want my gender results to be sent to my email address. Can I have them sent to someone else?
What email address should I provide during checkout?
Can I track my sample?
What is the shipping timeline?
How long does my sample stay stable after collection? How long can it stay stable during shipping?
Can I use SneakPeek if I am having a multiple-birth pregnancy?
How is the DNA blood sample taken?
How accurate is the SneakPeek Early Gender DNA Test?
When can I use the SneakPeek test?
When in my pregnancy can I take the SneakPeek Test?
Do you have a pregnancy calculator that tells me when I can take the test?
How does the SneakPeek Test work?