Accuracy 1st trimester ultrasound dating

The first trimester is defined as the first 13 weeks of pregnancy following the last normal menstrual period (some authors refer to early pregnancy as 0-10 weeks).It can be divided into a number of phases, each of which has typical clinical issues.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).

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However, if the doctor needs to check your cervix (mouth of uterus and birth canal), a transvaginal scan may be done as it is more accurate.Patient reported menstrual history, physician clinical evaluation, and ultrasonography are used to determine gestational age in the pregnant female.Previous studies have shown that pregnancy dating by last menstrual period (LMP) and physical examination findings can be inaccurate.When excluding the cases with no fetal pole, the median discrepancy of EDUGA versus RGA was 2 days (interquartile range (IQR) 1 to 3.25).The correlation coefficient of EDUGA with RGA was 0.978.These measurements are computed automatically in the ultrasound machine’s software.

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