Dating pregnancy by ultrasound

Posted by / 06-Apr-2020 22:20

Now keep counting Wednesdays until you reach the present date.LMP = December 2, 2019Current Date = February 4, 2020 Calculation: 1st Wed = December 9, 2019 = 1 Week 2nd Wed = December 16, 2019 = 2 Weeks 9th Wed = February 3, 2020 = 9 Weeks You are 9 Weeks and 1 Day pregnant During the scan, baby is measured and the age of pregnancy is estimated by comparing baby's size against recorded averages.Age of pregnancy can also be estimated by measuring the levels of h CG (Human Chorionic Gonadotropin) in the mother's blood.The results of this test indicate how far the pregnancy has progressed.

So if your last period started on April 11, you'd count back three months to January 11 and then add seven days, which means your due date would be January 18.Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle.But if your cycle is irregular, the LMP method may not work for you.If there is a significant difference between gestational age according to LMP and gestational age according to the ultrasound, you may be given a new gestational age and due date based on the ultrasound measurements.Your pregnancy may also be dated by ultrasound measurement if an LMP formula was not appropriate for your pregnancy for any reason.

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Just 4% of babies are born on their due date while 70% are born within 10 days of the estimated due date.

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