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The 12 week scan is a routine ultrasound examination carried out at 10 to 14 weeks of gestation.

At the first trimester scan they confirm that the fetus is alive, they assess the gestational age by measuring the crown-rump length and will also look for any major problems.

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It is this black space that you will see measured during the ultrasound scan.

Currently the most accurate non invasive test for detecting Down syndrome during pregnancy is the measurement of the nuchal translucency with an ultrasound between 11 to 14 weeks of pregnancy.

You will probably be give you a printout of your baby by the sonographer as a keepsake, it is important to remember the main purpose of the scan.

The first Trimester Scan, is Scans are usually performed by a doctors, midwives or radiographers who are specially trained in ultrasound, and are known as sonographers. The amount of liquor (amniotic fluid), the position and appearance of the placenta and a detailed scan of the baby itself.

The test cannot be performed outside this time frame as certain features that need to be seen on the scan are not present.

This test results in a 9095% detection rate of pregnancies that may be at an increased risk of carrying a genetical problem such as Downs Syndrome.

During the examination, the fetus is seen by abdominal ultrasound.

Occasionally the view is not clear and it may be necessary to perform a vaginal scan.

A scan maybe ordered when an abnormality is suspected on clinical grounds.

Otherwise a scan is generally booked in the first trimester to confirm pregnancy, exclude ectopic or molar pregnancies, confirm cardiac pulsation and measure the crown to rump length for dating.

Charts have been developed for this purpose, but some simple rules of thumb can also be effectively used.

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