A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Gestational age is a measure of the age of a pregnancy which is taken from the beginning of the woman's last menstrual period LMPor the corresponding age of the gestation as estimated by a more accurate method if available. You can calculate your due date by subtracting three months from the first day of your last menstrual period LMP and then add a week. Pettker, MD; James D. How accurate is a dating ultrasound at 9 weeks Your first trimester.
For many women, especially after 8 weeks gestation, sufficient information about the baby may be obtained with transabdominal ultrasound only. At seven weeks pregnant, your baby is about the size of a blueberry! Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. An ultrasound can help you determine how far along you are in your pregnancy. Every pregnant woman wants to know her due dateand a due date that is calculated from her last menstrual period with a due date calculator often doesn't match the due date that is estimated by her first ultrasound also known as a sonogram.
How accurate is ultrasound dating at 10 weeks. A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Take a look at each week of your pregnancy, from conception to birth, with our comprehensive email newsletters. Log in Sign up. NCBI Bookshelf.
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