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Dating ultrasound for amnio

These measurements are used to give you an estimated date of delivery and to tell you how many weeks your baby is.

This method of dating your pregnancy has been found to be more accurate than using your last menstrual period. Very occasionally the scan will show that a baby has a major anomaly.

Most women whose pregnancy is progressing without complications will be offered a maximum of two to three scans in their pregnancy.

In the second trimester this may be extrapolated to an estimate of gestational age and an estimated due date (EDD).

The BPD should be measured on an axial plane that traverses the thalami, and cavum septum pellucidum. BPD may also be influenced by factors such as abnormalities of head shape, breech presentation, or multiple gestations.

While rare, it is possible that the scan will find the baby has a major anomaly.

This is often unexpected and can be very upsetting.

This is sometimes called the mid-pregnancy or 20-week scan.

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The sonographer will take measurements and check that your baby is developing as expected.However, there is the small possibility that the sonographer will find an anomaly.This news most often comes as a shock and it can be very stressful waiting for a follow up scan to confirm the finding.Even if you are not having screening for Down's syndrome, the sonographer will tell you if the NT measurement is 3.5mm or higher.A raised NT can sometimes be an indicator of a problem in the baby's development.Depending on the type and number of markers, you might be offered an amniocentesis to rule out chromosomal problems.Being told about soft markers can make you anxious.Occasionally, the sonographer will see something called a "soft marker" on the scan.This is a feature picked up by the ultrasound equipment that is not harmful to your baby but can sometimes indicate that there is a problem with your baby's chromosomes, such as Down's syndrome.The transducer must be perpendicular to the central axis of the head, and thus the hemispheres and calvaria should appear symmetric. Ultrasound scans have been used in antenatal care for over thirty years and there is no evidence to suggest that they are harmful to you or your baby.

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