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How accurate are early ultrasounds in dating pregnancy

Prenatal testing consists of prenatal screening and prenatal diagnosis , which are aspects of prenatal care that focus on detecting problems with the pregnancy as early as possible. Screening can detect problems such as neural tube defects , chromosome abnormalities, and gene mutations that would lead to genetic disorders and birth defects , such as spina bifida , cleft palate , Downs Syndrome , Tay—Sachs disease , sickle cell anemia , thalassemia , cystic fibrosis , muscular dystrophy , and fragile X syndrome. Some tests are designed to discover problems which primarily affect the health of the mother, such as PAPP-A to detect pre-eclampsia or glucose tolerance tests to diagnose gestational diabetes. Screening can also detect anatomical defects such as hydrocephalus , anencephaly , heart defects , and amniotic band syndrome. Prenatal screening focuses on finding problems among a large population with affordable and noninvasive methods. Prenatal diagnosis focuses on pursuing additional detailed information once a particular problem has been found, and can sometimes be more invasive.
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How accurate are early ultrasound in dating conception or due date? | Yahoo Answers

A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. 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. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy.
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what week in pregnancy is most accurate in ultrasound dating?

Email: mail lifecall. Often young women who are pregnant and in High School worry about how they will ever graduate. Nalesha and proof that it can be done. When her family found out she was pregnant, she was told to leave.
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Please read our Disclaimer and Terms of Use. What is an estimated due date, and how is it determined? What are the risks of going past your due date?
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