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Early ultrasound accuracy dating conception

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).Even when the last period is known, ultrasound is reassuring to demonstrate adequate growth, especially when there’s a risk of delayed growth, as in hypertension or smoking, or if there’s the risk of exaggerated growth, as in gestational diabetes.the u/s specialist said i was 7w2d pregnant which means i got pregnant around the third day of my period which is b/s because, first of i do not have s_x when i am on my period. but then i read this an article by the doctor Jane Foley(you can google her) where she explains the dating of pregnancy and the "missing 2 weeks". It is not uncommon for babies that are labeled “Large for Gestational Age (LGA)” and “Intra Uterine Growth Restriction (IUGR)” to have monthly or even weekly ultrasounds during the pregnancy.When an ultrasound is performed, measurements of the head, abdomen, thigh, and amount of amniotic fluid are done.

The length of your pregnancy is calculated from the first day of your last menstrual period (LMP), even though you don't actually conceive until 14 days after your LMP, and later than this if your cycle is longer than 28 days.If you have an irregular cycle, or if you've recently been taking the contraceptive pill, working out the date from your LMP isn't a very accurate method.Ultrasounds are more accurate than using the LMP and, if the ultrasound date differs from your period dates, the ultrasound date will be used.The whole point of the scan is to work out how many weeks pregnant you are.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).Ask your GP if you want to have one anyway for extra reassurance, as she may be able to refer you.Dating scans are the most accurate way of predicting your due date.If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.For transvaginal ultrasound you can have an empty bladder Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.The ultrasound date is usually later than the period date, so accurate dating has been found to reduce the number of women having labour induced because their babies are overdue The ultrasound can check that your baby has a heartbeat and is developing normally.Your baby's head, limbs, hands and feet, and some organs can be seen, and - though looking for abnormalities isn't the purpose of the ultrasound - some major problems can be seen at this early stage.

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