An ultrasound is a highly accurate means of dating a pregnancy. In a normal pregnancy, ultrasound can provide an estimate of the gestational age to within five to seven days of accuracy. In the first trimester, doctors usually use a transvaginal rather than abdominal ultrasound. The transvaginal ultrasound provides the most accurate information, given that the early developing gestational sac and fetal pole are extremely tiny at this point.
Obstetric ultrasonography - Wikipedia
Watching the heartbeat and truly coming to terms with the reality that a tiny child is forming is one of the most amazing things anyone can feel. There are many reasons for needing a prenatal ultrasound, and lots of them are wonderful, but sometimes the screening can reveal horrible things that no parent wants to hear or see. Determining the gender of the baby is one of the most common reasons parents get excited to go for an ultrasound, because many people want to plan what kind of decor will be in the nursery and tell people what toys and clothes to purchase for the baby shower. Sometimes a pregnancy is unplanned, and an ultrasound is needed to figure out just how old the baby is and when the due date will be. Different states have various other recommended times to get an ultrasound, and these screenings are generally to look at how the baby is growing and developing, as well as monitor the health of the mother. Getting bad news during an ultrasound can be one of the most devastating experiences in a parent's world.
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Nuchal Translucency Screening
Objective: To assist clinicians in assigning gestational age based on ultrasound biometry. Outcomes: To determine whether ultrasound dating provides more accurate gestational age assessment than menstrual dating with or without the use of ultrasound. To provide maternity health care providers and researchers with evidence-based guidelines for the assignment of gestational age. To determine which ultrasound biometric parameters are superior when gestational age is uncertain. To determine whether ultrasound gestational age assessment is cost effective.
Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn't match the due date that is estimated by ultrasound also known as a sonogram. During an ultrasound, a technician spreads a warm gel over the lower part of the abdomen, and then presses a tool called a transducer against the belly to examine the fetus using sound waves. An image of the fetus appears on an accompanying computer screen. While looking at this image, the technician takes some standard measurements from different angles and listens for a heartbeat.