so they really can be drawn to brand new businesses, like SneakPeek, which claim in order to determine your baby’s sex with 99% precision at the beginning of the very first trimester, with just a straightforward bloodstream draw.
These brand new tests depend on what’s called cellular fetal that is free (cffDNA)–small fragments of DNA shed through the placenta into the bloodstream.
Unfortuitously, in accordance with a 2011 meta-analysis posted in JAMA, several of those organizations overstate the precision of the tests. The meta-analysis discovered that none of the tests that are cfDNA-based accurate before 7 days. (The meta-analysis also examined urine-based tests. None among these had been accurate.)
Between 7 and 20 months, precision of these blood-based tests ranged from 95-98%, with respect to the certain methods employed while the baby’s sex that is actual. (The tests had been more accurate if they make use of DNA amplification method referred to as real-time quantitative polymerase string response.) Just after 20 months had been the blood-based tests 97-99% accurate. Mehr lesen