Dating Scan? Dates & accuracy? | Yahoo Answers

What do other people think? I love the weeks indicator on the test. Also their customer care support is excellent, they have very friendly and helpful staff if you need any help. If you’re testing from the day of your expected period, you can test at any time of the day to find out if you’re pregnant. If you’re testing early, and for an accurate Weeks Indicator result, you must use the first urine of the day. Avoid drinking too much liquid before your do the digital pregnancy test. When ready to test, remove the test stick from the foil wrapper and take off the blue cap.

How accurate is a pregnancy dating scan when done at weeks pregnant? | Yahoo Answers

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Are you sure that you want to delete this answer? Yes Sorry, something has gone wrong. Your pregnancy will still be counted as 40 weeks so they will take the date of conception and add two weeks to it. Even women who know their lmp, when they ovulated and conceived and the scan backs all this up are still likely to give birth outside of their due date. The scan is supposed to be accurate to within a few days which somehow by the end of pregnancy has grown to an entire month!

That’s the crazy work of science for you. So for example if your due date was 15 May you could give birth two weeks either side of that and not actually be considered early or late. Although most women consider themselves late once they’ve gone over their due date it’s not how medical professionals will view it. Technically the earlier the scan is done the more accurate the due date and even by around 12 weeks it can be out. Very early on the foetus doesn’t vary much in size between women but as it grows it varies just like all babies vary in size at birth.

Since the date is worked out my taking measurements of the foetus it is a bit hit and miss. What makes it more inaccurate is that the sonographer has to be really careful too getting the perfect image and taking a measurement as accurate as possible. You can send 10 people in to do the scan and most likely get 7 or 8 different results. BTW my scan has also dated me at least a week off going by my lmp.

How accurate are dating scans at 12 weeks- Free tube watch

History Galton whistle, one of the first devices to produce ultrasound Acoustics , the science of sound , starts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Echolocation in bats was discovered by Lazzaro Spallanzani in , when he demonstrated that bats hunted and navigated by inaudible sound and not vision.

Francis Galton in invented the Galton whistle , an adjustable whistle which produced ultrasound, which he used to measure the hearing range of humans and other animals, demonstrating that many animals could hear sounds above the hearing range of humans. The first technological application of ultrasound was an attempt to detect submarines by Paul Langevin in

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Our how far along am I calculator uses your due date to calculate how many weeks, months and days you are pregnant. How far along am I, a question asked frequently by pregnant mothers, refers to the amount of time that has elapsed since the start of the last menstrual period LMP and generally not to the amount of time since baby was conceived. Pregnancy is normally counted from LMP which is about two weeks before baby is actually conceived.

Our how far along am I calculator will give you specific information about the week, month, day, and trimester you are in now. Historically, the first day of the last menstrual period LMP became the date from which pregnancy is counted even though conception occurs about two weeks later. The LMP formula is good for working out an initial age of pregnancy but ultrasound is more accurate. Age of pregnancy may be revised following your ultrasound scan.

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Transvaginal ultrasound is performed using a special transducer which is slightly thicker than a tampon. It is covered with a disposable latex sheath and lubricating gel, then gently placed into the vagina. The probe sits in the vagina throughout the examination which usually takes between minutes. Most patients find the examination much more tolerable when compared to a cervical PAP smear. During the scan the sonographer may need to gently press on the abdomen to move bowel out of the way and bring the ovaries and other pelvic structures into view.

This also enables any point of tenderness in the pelvis to be identified.

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Measuring[ edit ] Diagram showing crown-rump length by gestational age. The blue line is the mean and the green area delimits the 3rd versus the 97th percentile. The measurement can actually vary slightly if the fetus is temporarily stretching straightening its body. The measurement needs to be in the natural state with an unstretched body which is actually C shaped. The measurement of CRL is useful in determining the gestational age menstrual age starting from the first day of the last menstrual period and thus the expected date of delivery EDD.

Different babies do grow at different rates and thus the gestational age is an approximation.

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Ultrasonic Fetal Measurement Standards If we assume a fetus is growing normally, biometric measurements are determined by gestational age, and we can estimate the gestational age and thus the due date. Conditions which alter fetal growth will make the estimates less reliable. Although many embryonic and fetal structures can be measured, only a few measurements are easy and repeatable enough for widespread use. The most common are: The first element to be measurable is the gestation sac of the early pregnancy.

The gestational sac is measured in three dimensions, and the average, the Mean Sac Diameter MSD used for estimating gestational age.

Many medical personnel suggest having an ultrasound around 20 weeks of pregnancy to check for possible physical problems with the baby, or the placenta or fluid inside the uterus.

You may like to take a look at charts for crown-rump length , biparietal diameter , femur length , abdominal circumference , gestational sac diameter , yolk sac diameter and intrauterine fetal weight. If you have problems understanding and calculating your due date, check out and download a copy of the Ob calculator by York Winston. Hutchon’s site and the Gestation Network also provide pregnancy calculators.

A large number of mails I received are about fetal anomalies, I have therefore tried to put together a Catalogue of Web pages which describe in some detail specific congenital anomalies that are diagnosable by ultrasound. You can visit the page here. I am pregnant for 7 weeks. I went for a scan yesterday and was told I should have a full bladder.

Ultrasound: Sonogram – American Pregnancy Association

Content provided on this site is for entertainment or informational purposes only and should not be construed as medical or health, safety, legal or financial advice. Click here for additional information. I want to know if I should trust the accuracy on an ultrasound to date a pregnancy. Of all of these uses, dating the pregnancy is the most common reason to use ultrasound, particularly when the expectant mother cannot remember the date of her last period as in breast-feeding or irregular cycles.

how accurate are dating scans at 6 weeks. The first trimester is months one, two, and three of your localhost:81 are scan pictures taken during the early weeks of localhost:81ements taken at these early scans will help to; confirm a pregnancy, date the pregnancy and to see any problems that may occur in the pregnancy low lying placenta, twins etc.

It is usually part of an assessment called combined first trimester screening. Combined first trimester screening Combined first trimester screening assesses the risk for your baby having certain chromosomal abnormalities trisomy 13, 18 and This testing combines the nuchal translucency ultrasound with specific blood tests. Nuchal translucency ultrasound alone can also provide this risk assessment, but it is not as accurate as combined first trimester screening.

Combined first trimester screening is a non-invasive way of assessing your risk, which means it does not involve putting needles into the placenta or amniotic sac, as happens with CVS and amniocentesis. This means that combined first trimester screening simply tells us if your risk is low or high. For example, it tells us whether your baby has a low risk of having trisomy 13, 18 or 21, or whether your baby has a high risk of having trisomy 13, 18 or This test gives us an indication of whether we should worry about your baby based on these results.

This means that combined first trimester screening will not give us a definitive answer.

Accuracy of Carbon Dating

A fetus born prior to the 37th week of gestation is considered to be preterm. A preterm baby is likely to be premature and consequently faces increased risk of morbidity and mortality. An estimated due date is given by Naegele’s rule. According to the WHO, a preterm birth is defined as “babies born alive before 37 weeks of pregnancy are completed. In classifying perinatal deaths, stillbirths and infant deaths[ edit ] For most of the 20th Century, official definitions of a live birth and infant death in the Soviet Union and Russia differed from common international standards, such as those established by the World Health Organization in the latter part of the century.

If, however, they died within that interval, they were classified as stillbirths.

» How accurate are dating scans? Questions about pregnancy? Find out all you need to know in our pregnancy section. Read more. So if you did “it” 11+3 weeks ago a scan to say 13+5 is about right and only 2 days out. Add message | Report. MrsCharlesBrandon Wed Mar

We offer affordable prices with no compromise on quality. Why choose Ultrasound Direct Swindon? We’ve got a dedicated team of compassionate healthcare professionals, all hand-picked from the local area. Whether you want a pregnancy scan or a health screening scan for women and men, Ultrasound Direct Swindon can give you both the insights and the quality of care you’re looking for.

Our ultrasound scans can also include souvenir images, and even a movie of your 4D scan on DVD. If you are looking for peace of mind and a chance to bond with your baby, our ultrasound scans can also include souvenir images, and even a movie of your 4D scan on USB. Our pregnancy scans are longer than those offered by most other providers. Our early scan appointments, for instance, are 20 minutes long. This allows us to act on our duty of care with sensitivity should your scan outcome be unexpected.

What’s more, our trained healthcare professionals are backed up by a recognised clinical pathway for any further referrals. An Extensive Range Of Ultrasound Services Our expert team are highly qualified to offer a wide range of ultrasound scans for women’s and men’s health.

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