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.
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Ultrasound Accuracy for Predicting Due Dates
How Accurate Are Ultrasounds? Experts Weigh In
How accurate is a pregnancy ultrasound? You may be wondering this about your due date, your baby's sex, or more serious things like a miscarriage diagnosis. First, let's quickly go over the basics of ultrasound. An ultrasound —also known as a sonogram—uses sound waves to produce a picture of your baby in the womb. Ultrasound is an amazing tool for tracking the development of a pregnancy, and it gives doctors a lot of useful information for providing optimal prenatal care. It also, of course, gives you the first glimpse of your baby!
The accuracy of first trimester ultrasound in the diagnosis of hydatidiform mole
The first trimester is defined as the first 13 weeks of pregnancy following the last normal menstrual period some authors refer to early pregnancy as weeks. It can be divided into a number of phases, each of which has typical clinical issues. These phases are:. For a more detailed look at the stages of the first trimester see: ultrasound findings in early pregnancy. The earlier in pregnancy a scan is performed, the more accurate the age assignment from crown rump length.
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