Because an ultrasound at 7 weeks and one at 18 weeks use different methods for estimating gestational age, they have different levels of accuracy. In general, a skilled sonographer's 7 week ultrasound is more accurate for dating than a skilled sonographer's 18 week ultrasound. Talk with your health care provider for information specific to your situation.
The most accurate time is between 18-22 weeks. Anything before 18 weeks is more of a guess, and anything after 22 weeks the baby might be too big to see between the knees.
18 weeks has the most accurate outcome
The ultrasound at 18 weeks is about 90 to 95 percent accurate. It there is a flat place between the legs it means it is a girl if there is something hanging it means it is a boy.
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936 weeks* * * * *A year is not 52 weeks but 52 weeks plus 1 day (or 2 in a leap year). Allowing for these, 18 years is 1 or 2 days more than 939 weeks.
Yes, you can tell the sex of a baby at 16 weeks, and it is close to 100% accurate. But a few factors will determine whether or not you can see the gender at 16 weeks. The baby's position and the mother's weight determine if you can see the gender clearly. With heavier women, it is harder to see a clear picture of the gender. Some women decide to check for the gender at 18-20 weeks for a more accurate ultra sound.
The ultrasound dating has excellent and precise estimation of gestation especially if done in the first trimester (first 12 weeks). After 12 weeks, its accuracy goes down. However, compared to dating according to menstrual cycle, the ultrasound would be more accurate.
18 wks plusits about 18 weeks, usually by a scan but that isn't 100% accurate however mostly correct.
18 weeks = 126 days.
18 weeks x 168 hours/week = 3,024 hours in 18 weeks
126 days is 18 weeks.