A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. A dating scan might be recommended to confirm your due date if you are unsure of your last menstrual period or your date of conception. It is usually offered to pregnant women from 10 weeks to 13 weeks gestation, but can be carried out any time from 6 weeks. If you have had bleeding during your pregnancy or you have had previous miscarriages , your doctor or midwife may recommend an early dating scan from 6 to 10 weeks gestation.
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When will I have my dating scan? You'll have a dating scan, also known as a week scan between about 10 weeks and 14 weeks of pregnancy. For most mums-to-be, this is their first scan (NICE , Newson ). You'll only have a scan before this, between six weeks and 10 weeks, if you've experienced bleeding, pain, or problems in a previous pregnancy (Miscarriage Association nd). I am 13 weeks and have just had my dating scan. I know many people have these thoughts but there is no nose visible on the scan whatsoever. (Sorry I do not wish to post the picture). Also you cannot see the legs on the scan as they have been cut out. A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Dating scans also reveal other important information such as: the number of fetuses and gestation sacs. the presence of a heart beat. the size of the fetus, from which the .
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The dating scan is usually done at some point between 8 weeks and 14 weeks simplybeyondexpectations.com recommends it's done between 10 weeks and 13 weeks. You will have had earlier appointments and may have had an early scan if you've had any concerns such as bleeding, but otherwise this is the first time you'll get to see your baby, so it's a real milestone in your pregnancy. The person performing the scan is called a sonographer. You may need to have a full bladder for this scan, as this makes the ultrasound image clearer. You can ask your midwife or doctor before the scan if this is the case. The dating scan usually takes about 20 minutes. Find out more about what happens during a pregnancy ultrasound scan. Compliance tests dating - Register and search over 40 million singles: matches and more. Find a woman in my area! Free to join to find a woman and meet a woman online who is single and looking for you. If you are a middle-aged woman looking to have a good time dating woman half your age, this advertisement is for you.
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What is the purpose of the dating scan?
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The screening is widely available, but because it requires special training and equipment, not all healthcare providers provide it.
A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. Dating scans are used to confirm how many weeks pregnant you are and your expected due date. A dating scan might be recommended to confirm your due date if you are unsure of your last. These tests use blood samples taken from the mother, measurements taken from ultrasound scans (nuchal translucency scan/dating scan) or both to work out this chance. The NHS Fetal Anomaly Screening Programme now recommends that women have the combined screening for Down's syndrome (blood test and nuchal translucency scan) rather than just the. Like other screening tests, an NT scan won't give you a diagnosis. The scan can only assess your baby's risk for certain problems and help you decide whether to have chorionic villus sampling (CVS) or amniocentesis to find out whether your baby is actually affected. You can also wait and combine the results with second trimester screening results for more information about your baby's risk.
Women who are at high risk for carrying a child with Down syndrome or are 35 or older may be offered cell-free DNA testingwhich can be done as early as 10 weeks. This test is thought to be more than 98 percent accurate in detecting Down syndrome, but women who get a positive result would still need CVS or amniocentesis for a sure diagnosis. First-trimester screening lets you learn about your baby's risk for chromosomal problems relatively early in the pregnancy without subjecting yourself to the slight risk of miscarriage from an invasive test like CVS.
If the risk is low, the results will offer you some reassurance. If the risk is high, you may want to consider CVS, which will reveal whether your baby has a problem while you're still in your first trimester. Keep in mind that CVS is usually done between 10 weeks and 13 weeks, 6 days.
So to keep your options open, it's best to complete your first-trimester screening earlier rather than later. Or you can wait and have amniocentesis in your second trimester. The American College of Obstetricians and Gynecologists recommends that women of all ages be offered first- and second-trimester screening and diagnostic testing options.
Your practitioner should discuss the pros and cons of various approaches with you. If you need further information, consider meeting with a genetic counselor. But ultimately, whether to test and which tests to have is a personal decision. Many women opt for screening and then make a decision about diagnostic testing meaning CVS or amnio based on the initial results.
Introduction to Transvaginal Ultrasound Scanning-Part II
Other women opt for diagnostic testing without screening first. They may know that they're at high risk for a baby with a chromosomal problem or a problem that can't be detected by screening. Or they may just want to know as much as possible about their baby's condition and are willing to live with the small risk of miscarriage to find out.
Some women decide to have no screening or testing at all. The sonographer first confirms your baby's gestational age by measuring him from crown to rump to see whether he's about the size he should be for his age.
Then she positions the sensor, called the transducer, over your abdomen so that your baby's nuchal translucency shows up on the monitor and measures the thickness of it on the screen with calipers.
Your baby's chances of having a chromosomal abnormality are determined by the nuchal translucency measurement, your age, your baby's gestational age and the blood test results. Your age is factored in because although anyone can have a baby with a chromosomal abnormality, the risk increases as you age. For example, your likelihood of carrying a baby with Down syndrome ranges from approximately 1 in 1, at age 25 to 1 in at age Because a baby's nuchal translucency normally gets a bit thicker with each day of gestation, researchers have been able to establish how large the translucent area should be each day during the three weeks the screening can be performed.
They've also calculated the statistical relationship between this measurement, the baby's age, the mother's age, and the likelihood that the baby will be born with certain abnormalities. In general, the thicker the nuchal translucency at a given gestational age, the higher the chance of a chromosomal problem.
You may get the results right away, or you may have to wait up to 10 days if the doctor has to send the data to a processing center.
You'll want to talk with your practitioner or a genetic counselor about how to interpret the results because unless you have a lot of experience with statistical analysis and evaluating the results of medical tests, the results can be confusing. And even if you're a wizard with statistics, you'll need help understanding your options. You'll get your results in the form of a ratio that expresses your baby's chances of having a chromosomal defect.
For example, you may be told that your baby's chances of having Down syndrome are 1 in 30 or 1 in 4, A risk of 1 in 30 means that for every 30 women with this same result, one baby will have Down syndrome and 29 will not. A risk of 1 in 4, means that for every 4, women with this result, one baby will have it and 3, will not. The higher the second number, the lower the risk.
You may also be told that your results are "normal" or "abnormal," depending on whether they are below or above a specified cutoff. For example, some tests use a cutoff of 1 in So a result of 1 in 4, would be considered normal because the risk that there's a problem is lower than 1 in A ratio of 1 in 30 would be considered abnormal because that risk is higher than 1 in Remember that a normal screening result screen negative isn't a guarantee that your baby has normal chromosomes, but it does suggest that a problem is unlikely.
Likewise, an abnormal screening result screen positive doesn't mean that your baby has a chromosomal problem - just that he's more likely to have one. Most screen-positive babies turn out not to have a problem: Only about a third of babies with an increased nuchal translucency measurement turn out to have chromosomal defects.
If your baby's nuchal translucency measurement is above the 99th percentile for his gestational age, he's considered to be at increased risk for major congenital heart disease as well, so you'll be given a special ultrasound called a fetal echocardiogram.
If your baby has a heart defect, he'll need to be monitored with regular ultrasounds and delivered at a medical center equipped to handle this condition.
Screening tests aren't perfect. They don't detect all cases of Down syndrome, so they may identify your baby as being at low risk when she really does have Down syndrome.
This is called a false negative result, and it might lead you to decide against diagnostic testing that would have revealed a problem. Conversely, screening may identify your baby as being at high risk when she is fine a false positive. This may cause you to undergo further testing and to worry about your baby's well-being unnecessarily.
The reliability of a test can be seen in its detection rate.
This tells you how good the test is at identifying babies that are truly affected as being high risk. Specifically, it's the percentage of affected babies who show screen-positive results, out of all those being screened. The NT scan alone will detect about 70 to 80 percent of babies with Down syndrome depending on which study you look at. The detection rate for the NT scan plus a first-trimester blood test ranges from 79 to 90 percent. These numbers mean that if you're carrying a baby with DS, there's a 79 to 90 percent chance that the combined screening will detect the abnormality and give you what's called a screen-positive result indicating that further testing is recommended.
It also means there's a 5 to 21 percent chance that the tests will miss the DS and give you a screen-negative result.
Dating scan tests
This does not mean that a screen-positive baby has a 79 to 90 percent chance of having Down syndrome. It just means that 79 to 90 percent of babies who have DS will have screening results that are suspicious enough to recommend diagnostic testing.
And 5 to 21 percent of babies who have DS will be determined to be at normal risk - that is, the results will be misleading. These tests also have a 5 percent false-positive rate. A false-positive result is one that suggests there may be a problem when, in fact, there is no problem.