- Why would I have a dating scan?
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- Ultrasound: Sonogram - American Pregnancy Association
- First Trimester
This occurs only 1 percent of the time. And your doctor will also be able to tell if you're pregnant with multiples. Other tests All pregnant women are offered a nuchal translucency NT test, performed between 11 and 13 weeks, and this involves another ultrasound. The NT evaluates your risk of having a baby with Down syndrome, trisomy 18 another chromosomal abnormality , or certain heart defects. In this two-part exam, a blood test measures levels of certain hormones and proteins in your body, and an ultrasound determines the thickness at the back of baby's neck increased thickness indicates that he may be at risk for birth defects such as Down syndrome and trisomy At this stage, your ultrasound will likely be done on your abdomen.
While you're reclining on an exam table, the doctor or ultrasound technician will slather gel on your belly, and then glide a plastic transducer over it. The test doesn't hurt, although the gel may feel cold and be messy. Wear two-piece clothing to your ultrasound, to allow for easy access to your tummy. At some high-tech centers, doctors use 3-D ultrasound to provide pictures of the baby with photograph-quality details.
High-tech centers may use this type of ultrasound to better evaluate a baby's growth and development , as well as detect facial abnormalities or neural tube defects. Safety info An ultrasound is considered safe for both you and your baby when it's used for medical purposes. Experts discourage getting 3-D and 4-D moving picture ultrasounds at fetal portrait studios in places like shopping malls, where untrained personnel may give out inaccurate information. The middle of your pregnancy is thrilling for many reasons: You really look pregnant and not just like you've been noshing on too many bagels.
And you're due for a detailed ultrasound, generally between weeks 18 to 20 of pregnancy, which will give you a good, long look at your baby. What to expect at your exam This ultrasound, called an anatomy scan, lasts 20 to 45 minutes if you're having one baby, longer if you're having multiples. Your ob-gyn uses it to assess the baby's growth and make sure all of her organs are developing properly. You'll be able to see your baby's developing body in great detail, but it can be hard for an untrained eye to distinguish the kidneys from the stomach. Ask your doctor or tech can point out organs to you as she reads the scan.
While you're reclining on an exam table, the doctor or ultrasound technician slathers gel on your abdomen, and then glides a plastic transducer over your belly. The transducer transmits high-frequency sound waves through your uterus. They bounce off the fetus, sending signals back to a machine that converts these reflections into a black and white image of your future babe.
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It's an emotional experience to see your child up there on the TV screen. The test doesn't hurt, although, again, the gel may feel cold and be messy. Wear two-piece clothing to your ultrasound, to allow for easy access to your tummy you'll get a towel afterward so you can wipe off the gel.
Why would I have a dating scan?
Why it's important This is the most thorough checkup your baby will have before she is born. The doctor will check your baby's heart rate and look for abnormalities in her brain, heart, kidneys, and liver. She'll count your baby's fingers and toes, check for birth defects, examine the placenta, and measure the amniotic fluid level. And she'll probably be able to determine your sweet pea's sex, although it's not a slam dunk; an experienced tech gets it right more than 95 percent of the time.
If you don't want to know your baby's sex, let her know ahead of time. You might even get a 3-D view, which will offer a true-to-life glimpse of your baby's nose and bone structure.
First trimester ultrasound dating
Don't worry—when she arrives she'll be cuter than the alien-like image she presents on the TV screen! Other tests Between 14 and 20 weeks, you may have an amniocentesis to check for Down syndrome. Women whose screening test revealed a potential problem, who are 35 or older, or who have a family history of certain birth defects should consider an amniocentesis. In this procedure, a needle is inserted through your belly and into your uterus to take a sample of amniotic fluid, and your health care provider may use ultrasound to guide the placement of the needle. There's a very small.
For many pregnant women, their last ultrasound takes place at their week anatomy scan.
Ultrasound: Sonogram - American Pregnancy Association
If you've gone past your due date, your doctor may want to keep a close eye on your baby with fetal heart-rate monitoring and ultrasounds to assess the amniotic fluid levels. Other reasons for third-trimester ultrasounds include concerns about the health of the placenta and questions about whether your baby's growth is on track.
Just think of those sessions as time spent getting to know your baby. Soon enough, you'll be looking right in his baby blues. What to expect at your exam Earlier in your pregnancy, your doctor may have asked you to hold off on peeing before your scan. Now that your uterus and the fetus are larger and you have more amniotic fluid , a full bladder matters less. When you schedule your exam, ask your doctor about this issue. Why it's important Many moms-to-be don't need an ultrasound in the third trimester, but if you're over age 35 or your doctor wants to closely monitor your baby's growth, you may get one or more before baby is born.
Other reasons for third-trimester ultrasounds include low levels of amniotic fluid, bleeding, and pre-term contractions. Accuracy first trimester ultrasound dating In the first trimester to get informed about the center.
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