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I have had many conflicting ultrasounds. I had the exact opposite problem- the femur length was a week further in gestation than the head or abdomen, and the estimated weight put her a week further along than her femur. What my ultrasound technician told me was to trust in the initial date given by the obgyn when I had my very first ultrasound (I was only 5 weeks at my first appt). The earlier the scan, the less the variation in size. I am 5'1, but with those long legs, I guess our little girl is going to be 6'5 like her daddy!

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Q: In your ultrasound the head circumference and abdominal diameter were the same length but the femur lenght was smaller which is more accurate?

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The best person to ask is the person doing the ultrasound. Having said that here are a few guidelines. Ultrasounds can give you a fairly accurate time for the length of the pregnancy. Before 10 weeks the measurement taken is crown-rump length, from the top of the head to the bottom of the spine. This is accurate to within 3-4 days. After about 12 weeks several measurements are taken, head circumference, head diameter and abdominal diameter as well as femur length and the results are plotted on a graph to compare with the estimated length of pregnancy. The earlier the measurements are taken the more accurate they are in assessing the length of the pregnancy.

Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)

diameter = circumference/pi

Diameter = Circumference/pi

circumference is Pi, 3.14, times the diameter. If the diameter is 3 then the circumference is 9.42

Circumference of a circle = diameter*pi Diameter of a circle = circumference/pi

Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.

circumference=pie x diameter diameter= circumference/pie pie= 3.141592654

Circumference = pi*diameter So diameter = circumference/pi = 1.59 units

The circumference of a circle with a diameter of 10 is: 31.416. (Circumference = Pi x diameter)

Circumference = pi*diameter So diameter = circumference/pi = 9.87 mi

circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.

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