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Sometimes a trans-vaginal examination shows that your pregnancy is less advanced than expected.

The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.

5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!

) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).CRL measurement is determined by ultrasound between 6 and 13 weeks and is considered to be the main reference for determining gestational age (GA) in early pregnancy as there is little variation at this point in development.Even in women who have regular 28-day cycles, there can be discrepancy in gestation age due to variations in the day of ovulation. The scale below provides an idea of how a CRL measurement can be used to determine gestational age down to the week and day. To evaluate these strategies we generated a data set with no truncation of GA that was similar to the INTERGROWTH-21 Project CRL data, which we used to explore the performance of different methods of analysis of these data when we imposed truncation at 9 and 14 weeks of gestation.These 3 methods were first tested in a simulation based study using a previously published dating equation by Verburg et al.Most dating scans are done with a trans-abdominal transducer and a fullish bladder.

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