If a level 2 sonogram at 19 weeks tells you are having girl what the odds of it being wrong?

According to the American College of Obstetricians and Gynecologists (ACOG), the chance of a level 2 ultrasound performed at 19 weeks being wrong about the sex of the baby is less than 1%. This means that the accuracy rate for determining fetal sex at this stage of pregnancy is very high.