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Are first trimester ultrsounds accurate dating

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However, if you have a larger than average baby, the ultrasound will apply the husky figures to the “normal” measurements.

This creates error in that the baby will compute out to be further along than he or she really is.

The level of the amniotic fluid also is measured and used in the calculations.

You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).

Using the date of the last period gives a general idea of that information, but abnormalities in the cycle or inaccuracies in the date affect the calculations.

Ultrasounds commonly are used to determine the age of a fetus.

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.