Accuracy 1st trimester ultrasound dating
Also the fetus cannot bend and twist too much yet, so the length of the body is fairly constant.
However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.
The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.
Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.
Using a single ultrasound examination in the second trimester to assist in determining the gestational age enables simultaneous fetal anatomic evaluation.
Most dating scans are done with a trans-abdominal transducer and a fullish bladder.
As the baby gets bigger, it starts to express its individual growth potential.
The size of the baby correlates less and less with its age as time goes on.
For transvaginal ultrasound you can have an empty bladder Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.
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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.