Pregnancy ultrasound dating accuracy
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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!
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Accuracy of ultrasound for dating pregnancy
Dating Ultrasound - Ultrasound Accuracy for Predicting Due Dates
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Ultrasound Accuracy for Pregnancy Issues
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.
Objective: To compare last menstrual period and ultrasonography in predicting delivery date. Methods: We used ultrasound to scan 17, nonselected singleton pregnancies at completed weeks. The last menstrual period LMP was considered certain in 13, and uncertain in cases. The duration of pregnancy from the scan to the day of spontaneous delivery was predicted by crown-rump length, biparietal diameter BPD , and femur length FL using linear regression models, and the results were compared with estimates based on LMP. Results: At all gestational ages, ultrasound was superior to certain LMP in predicting the day of delivery by at least 1.
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