The review, which looked at 57 studies representing 6,541 pregnancies, found the blood tests gave a genuine result (sensitivity) 95% of the time and that this result was accurate or correct for gender (specificity) 98.6% of the time.

How accurate is blood test for gender?

NIPTs are a safe way to detect chromosomal abnormalities earlier in pregnancy than more invasive kinds of genetic screenings. They're generally very accurate (though not 100 percent). As a nice bonus, they can tell you whether you're having a boy or a girl.

Can a pregnancy gender blood test be wrong?

The chances of a sex determination via NIPT being wrong is around 1 percent when the test is conducted after week 10 of your pregnancy or later, Schaffir says.