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下周滿18週, 醫生就要我們去作高層次超音波,
之前我還擔心, 一般都會要20週時才去照,
上網去找了一下, 原來18-20週都可以作.
已有一個可愛寶寶的妹妹說,
這樣很好阿, 早一點作早知道很好阿.
也是, 親愛的小胖胖下週我們又可以看到你了...
媽媽很期待唷. 
你要健健康康的長大唷... 
由於這個檢查要作1小時,
我先上網作功課, 看看它能看到什麼?
http://www.babycenter.ca/pregnancy/antenatalhealth/scans/secondtrimesterscans/
Your 20 week ultrasound
Most women are offered an ultrasound between 18 and 20 weeks to see if the baby has developed normally; this is known as the anomaly scan. You will now be halfway through your pregnancy and your baby will be about 20cm (8 inches) long from head to toe, your bump will be growing rapidly and you will probably be feeling some of your baby's movements.
Seeing your baby on a screen is a very exciting and emotional time; your partner and your other children are welcomed by most hospitals to share the experience with you. Many couples want to know the sex of the baby and have some photos but before you have the scan, you should understand that its main purpose is to look for abnormalities.
Seeing your baby on a screen is a very exciting and emotional time; your partner and your other children are welcomed by most hospitals to share the experience with you. Many couples want to know the sex of the baby and have some photos but before you have the scan, you should understand that its main purpose is to look for abnormalities.
Informed consent
You should be given written information early in pregnancy by your midwife or doctor to outline the purpose, benefits and limitations of the ultrasound. This will allow you time to think about whether or not you would like one. It is for you to decide -- ultrasounds are not compulsory.
Can I watch the ultrasound?
Most hospitals allow you to watch the ultrasound as it is being performed, either on the same screen as the sonographer, or on a separate one at the end of the couch. The sonographer will start by first counting the babies -- twins are sometimes not found until 20 weeks! She will point out the heartbeat and parts of the baby like the face and hands (see image, below) before doing the detailed check. At this point, some sonographers will turn the screen away for the rest of the scan and show you views again at the end. Other ultrasound technicians might choose to do the scan first and give you a tour at the end, inviting your partner and family in at that time. The scan takes about 15-20 minutes.
Face and hands at 20 weeks' gestation
Face and hands at 20 weeks' gestation
What is examined at the 20 week ultrasound?
Your baby's internal organs are examined in cross sectional views, or "slices" of your baby, which may be difficult -- if not impossible -- for you to make out! Bones will look white on the scan, fluid will be black and soft tissues will look grey and speckled.
The head
The head is usually examined first. A normal head is rugby-ball shaped with a mid-line separating the two halves of the brain which are surrounded by fluid. There is a dumb-bell shaped structure called the cerebellum (hindbrain) at the back of the head.
Spine and abdominal wall
The sonographer will check your baby's spine in both the long view and in cross section, moving through the neck and shoulders to the pelvis. She is making sure that all the vertebrae are in alignment, that the skin covers the spine at the back and the baby's abdominal wall covers all the internal organs at the front.
Heart and stomach
She will look at the heart, which should occupy a third of the chest and point to the left. The top two chambers, or "atria", and the bottom two chambers, or "ventricles", should be equal in size and the valves should open and close with each heartbeat. She will then look beneath the diaphragm to see the stomach, under the heart on the left side. Your baby swallows some of the amniotic fluid that it lies in; this can be seen in the stomach as a black bubble.
Kidneys and bladder
The two kidneys are either side of the spine, below the stomach and are usually quite hard to see. If the baby's bladder is full, it's easy to see as a black bubble in the pelvis. If it is empty it should fill up during the scan -- your baby has been peeing every half an hour or so for some months now!
Hands and feet
The long bones and position of hands and feet are examined; the fingers and toes are looked at but not counted.
Placenta, umbilical cord and amniotic fluid
The placenta may be on the front or the back wall of your womb, usually near the top (or fundus) so may be described as "fundal" on your ultrasound report. Many are described as "low" because they reach down to or cover the neck of the womb (cervix). If your placenta is low, another ultrasound will be arranged in the third trimester, by which time most placenta will have moved away from the cervix. (Read more about having a low-lying placenta.)
It is possible to count the three vessels in the umbilical cord but this may not be done routinely. There should be enough amniotic fluid surrounding the baby to allow it to move freely at this stage.
More detailed ultrasound
Some hospitals offer a more detailed scan of the heart to look at the major blood vessels; some also examine the baby's face and lips. Whether your hospital offers this depends on the quality of the ultrasound machines, the time available for each scan and on whether or not the sonographers have had special training to do this.
If you have a history of premature labour or late miscarriage, an ultrasound to measure the length of your cervix may be performed.
The head
The head is usually examined first. A normal head is rugby-ball shaped with a mid-line separating the two halves of the brain which are surrounded by fluid. There is a dumb-bell shaped structure called the cerebellum (hindbrain) at the back of the head.
Spine and abdominal wall
The sonographer will check your baby's spine in both the long view and in cross section, moving through the neck and shoulders to the pelvis. She is making sure that all the vertebrae are in alignment, that the skin covers the spine at the back and the baby's abdominal wall covers all the internal organs at the front.
Heart and stomach
She will look at the heart, which should occupy a third of the chest and point to the left. The top two chambers, or "atria", and the bottom two chambers, or "ventricles", should be equal in size and the valves should open and close with each heartbeat. She will then look beneath the diaphragm to see the stomach, under the heart on the left side. Your baby swallows some of the amniotic fluid that it lies in; this can be seen in the stomach as a black bubble.
Kidneys and bladder
The two kidneys are either side of the spine, below the stomach and are usually quite hard to see. If the baby's bladder is full, it's easy to see as a black bubble in the pelvis. If it is empty it should fill up during the scan -- your baby has been peeing every half an hour or so for some months now!
Hands and feet
The long bones and position of hands and feet are examined; the fingers and toes are looked at but not counted.
Placenta, umbilical cord and amniotic fluid
The placenta may be on the front or the back wall of your womb, usually near the top (or fundus) so may be described as "fundal" on your ultrasound report. Many are described as "low" because they reach down to or cover the neck of the womb (cervix). If your placenta is low, another ultrasound will be arranged in the third trimester, by which time most placenta will have moved away from the cervix. (Read more about having a low-lying placenta.)
It is possible to count the three vessels in the umbilical cord but this may not be done routinely. There should be enough amniotic fluid surrounding the baby to allow it to move freely at this stage.
More detailed ultrasound
Some hospitals offer a more detailed scan of the heart to look at the major blood vessels; some also examine the baby's face and lips. Whether your hospital offers this depends on the quality of the ultrasound machines, the time available for each scan and on whether or not the sonographers have had special training to do this.
If you have a history of premature labour or late miscarriage, an ultrasound to measure the length of your cervix may be performed.
What is measured?
Measurements of your baby's head circumference (HC) and diameter (biparietal diameter or BPD -- see image, below) are taken, along with the abdominal circumference (AC) and femur or thigh bone (FL), to date the pregnancy and to make sure your baby is growing normally. If there is more than seven days' difference between your ultrasound dates and your dates according to your last monthly period (LMP) in the second trimester, the ultrasound dates will be used from now on.
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