The femur (thigh bone) length seems to hold on to it’s accuracy longer than the other parameters, but after 36 weeks it isn’t foolproof.Two ultrasounds taken one month apart that agree with each other on when the due date is, yield a very accurate and reliable answer.If you don’t want to know the sex of your baby, let your health care provider and the ultrasound technologist know.

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A fetal ultrasound provides important medical information about your baby‘s growth and expected due date.

The software has certain measurement scales based on data from large populations, and your baby’s measurements are put into this scale.

In other words, by comparing your baby’s measurements to the data from this large collection of measurements, the ultrasound can then tell how far along your baby is.

When an ultrasound is performed, measurements of the head, abdomen, thigh, and amount of amniotic fluid are done.

These measurements are computed automatically in the ultrasound machine’s software.

So in this arithmetic test, the baby sets the curve.

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There are two types of ultrasounds: Your health care provider will recommend what ultrasound is best for you based on your circumstances.