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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 baby will be measured, and the anatomy examined in detail.
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 nuchal translucency (also spelled nucal translucency) is a collection of fluid beneath the fetal skin in the region of the fetal neck and this is present and seen in all fetuses in early pregnancy.
The fluid collection is however increased in many fetuses with Down's syndrome and many other chromosomal abnormalities.
The test is performed between 11 weeks and 13 weeks 6 days into your pregnancy.
The test cannot be performed outside this time frame as certain features that need to be seen on the scan are not present.
For example, a CRL of 23 mm would correspond to a gestational age of 9 weeks and two days (6 weeks plus 23 days = 9 weeks and 2 days).
Accuracy of CRL after 12 weeks in predicting gestational age diminishes and is replaced by measurement of the width of the fetal head (biparietal diameter or BPD).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.The crown rump length is a universally recognized term, very useful for measuring early pregnancies.In the past few years it has been seen that approximately 3 in 4 babies with Down's syndrome do not have a visible nasal bone at the time of the first trimester screening test.If the nasal bone is visible at the scan then this will reduce the chance of your baby having Down's syndrome.There is no hard and fast rule for the number of scans you should have during pregnancy.