Within hours of giving birth, your baby’s DNA fragments degrade and disappear from your circulation. These fragments cffDNA, first discovered in pregnant women in 1997, are detectable in your blood starting around 7 weeks of pregnancy, and increase in amount throughout pregnancy. How Do Blood-Based Tests for Fetal Sex Work?ĭuring pregnancy, small fragments of your baby’s DNA shed from the placenta into your circulation. (The tests were more accurate when they use a DNA amplification technique known as real-time quantitative polymerase chain reaction.) Only after 20 weeks were the blood-based tests 97-99% accurate. None of these were accurate.)īetween 7 and 20 weeks, accuracy for these blood-based tests ranged from 95-98%, depending on the specific techniques employed and the baby’s actual sex. (The meta-analysis also examined urine-based tests. The meta-analysis found that none of these cfDNA-based tests are accurate before 7 weeks. Unfortunately, according to a 2011 meta-analysis published in JAMA, some of these companies overstate the accuracy of their tests.
#SNEAK PEEK GENDER TEST ACCURACY 2019 FREE#
These new tests rely on what is known as cell free fetal DNA (cffDNA)–small fragments of DNA shed from the placenta into your bloodstream. Many expectant parents are impatient to learn if they are having a boy or a girl. So they may be attracted to new companies, like SneakPeek, which claim to be able to determine your baby’s sex with 99% accuracy early in the first trimester, with only a simple blood draw.
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