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The estimated date of delivery (EDD), also known as expected date of confinement, [1] and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. [2] Normal pregnancies last between 38 and 42 weeks. [3] Children are delivered on their expected due date about 4% of the time. [4]
The mean pregnancy length has been estimated to be 283.4 days of gestational age as timed from the first day of the last menstrual period and 280.6 days when retrospectively estimated by obstetric ultrasound measurement of the fetal biparietal diameter (BPD) in the second trimester. [12]
Early in pregnancy gestational age 8 weeks, it is accurate within about +/- 5 days but later in pregnancy due to different growth rates, the accuracy is less. In that situation, other parameters can be used in addition to CRL. The length of the umbilical cord is approximately equal to the CRL throughout pregnancy.
The resultant estimated gestational age and due date of the fetus are slightly more accurate than methods based on last menstrual period. [84] Ultrasound is used to measure the nuchal fold in order to screen for Down syndrome. [85]
In general, it's best to wait until you've missed your period, and to take the test first thing in the morning. Learn how timing impacts accuracy from experts.
The app provides users with personalized resources, tools, and information based on their due date or child’s birthday, including 3D renderings, common symptoms, and weekly videos. [ 14 ] [ 15 ] As of November 2024, the app had over 5 million downloads on the Google Play Store and more than 340,000 reviews on the Apple App Store .
Fans of Ashley Graham expressed concern after the supermodel shared a full-term pregnancy photo. Is it safe to carry twins to 40 weeks? And how long is the average twin pregnancy? Experts weigh in.
The rabbit test became a widely used bioassay (animal-based test) to test for pregnancy. The term "rabbit test" was first recorded in 1949, and was the origin of a common euphemism, "the rabbit died", for a positive pregnancy test. [4] The phrase was, in fact, based on a common misconception about the test.