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Dating ultrasound vs lmp

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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.

Predicting delivery date by ultrasound and last menstrual period in early gestation

Methods for Estimating the Due Date | ACOG

Error: This is required. Error: Not a valid value. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Read on for more information about what a dating scan offers. A dating scan might be recommended before 12 weeks to confirm your due date if you are unsure of your last menstrual period or your date of conception.

Methods for Estimating the Due Date

Once you finally got that positive pregnancy test , the next thing on your mind must have been - when will the baby arrive? There are two main techniques for obtaining the EDD. Both are common medical practice, and both are used in this Estimated Date of Delivery calculator. In essence, the first one is based on the date of your Last Menstrual Period, and the second one relies on the results of an Ultrasound Ultrasonography, US examination.
Probably the most important thing we do on the first visit if establish your due date. Dating by this method involves putting the date into an app or calculator or pregnancy wheel and it spits out the due date. This is a simple calculation based on assumptions that you conceived exactly 14 days after the first day of your period and that your due date will be 40 weeks after that first day.
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