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When can i have a dating scan

At the first trimester scan they confirm that the fetus is alive, they when can i have a dating scan the gestational age by measuring the crown-rump length and will look for any major problems. This is a routine ultrasound examination done at 10 to 14 weeks of gestation. 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. You do not need to have a full bladder, a moderately filled bladder is needed for a proper examination. Most parents look forward to their scan because it gives them the first glimpse of their baby. 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 not to provide the first photo for your baby album, or to find out your baby’s sex.

It is to check that your baby is growing and developing normally. Ultrasound information :-    Who, Why, When? What happens during an ultrasound examination? Can the scan show the gender of my baby? Scans are usually performed by a doctors, midwives or radiographers who are specially trained in ultrasound, and are known as sonographers. The whole pregnancy will be assessed.

It is recommended that all pregnant women have a scan in the first trimester at around 12 weeks of pregnancy to confirm their dates. When is the nuchal fold screening test carried out? 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.

If you are unsure of your period dates or have an irregular cycle, we suggest that you contact your doctor, midwife or health care provider as early as possible to arrange for a dating scan. There is no hard and fast rule for the number of scans you should have during pregnancy. 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.

What is the 12 week NT scan? The 12 week scan is a routine ultrasound examination carried out at 10 to 14 weeks of gestation. The crown rump length is a universally recognized term, very useful for measuring early pregnancies. Charts have been developed for this purpose, but some simple rules of thumb can also be effectively used. From 6 to 11 weeks gestational age, the fetal CRL grows at a rate of about 1 mm per day. The fluid collection is however increased in many fetuses with Down’s syndrome and many other chromosomal abnormalities. 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.

This is normally less than 2. Down syndrome or may indicate another chromosomal abnormality. The nuchal translucency test will also check whether your baby has a visible nasal bone. 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. The first two lines, are horizontal and parallel to each other, resembling an ‘equal sign’.

The top line represents the skin and bottom one, represents the nasal bone. A third line, almost in continuity with the skin, but at a higher level, represents the tip of the nose. Occasionally the nasal bone cannot be seen at 11 weeks as it is too early in the pregnancy. If this is the case and this creates some concern then the scan can be repeated a week later. However if the nasal bone cannot be seen clearly but the nuchal translucency and blood tests are predicting a low risk result it is sometimes not necessary to see the nasal bone in every case. Examples of ultrasonography you may see used during your pregnancy. The nuchal translucency test can also check whether your baby has all its limbs, that the head and brain appear to be developing normally, that the baby has a visible stomach and bladder and the umbilical cord is inserted correctly.

From 12 weeks the spine can usually be seen clearly enough to rule out major cases of spina bifida. All of this information will hopefully provide important reassurance. The following features would also be looked for but are not so important as those listed above, and have been reported by some studies to give an increased risk of chromosomal problems. This is to perform two biochemical tests on hormones released by the body during pregnancy on a biochemistry analyser. The two hormones measured in your blood are both produced by the placenta and are unique to each pregnancy. If the two hormone levels are favourable they will reduce the chance of your baby having Down’s syndrome. If they are less favourable they will increase the chance.