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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]
Once the estimated due date (EDD) is established, it should rarely be changed, as the determination of gestational age is most accurate earlier in the pregnancy. [6] Assessment of gestational age can be made based on selected head and trunk parameters. [7]
An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).
Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of 280 days at childbirth. The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.
The site also features a Pregnancy Planner, with fetal development photos, a customized newsletter and pregnancy info synchronized to a mother's due date; a baby namer tool, with thousands of name descriptions; a fertility calculator, buying guides, blogs, along with resources for health and safety, and child development.
In two recent papers published in Science [18] and Cell, [19] Melbye, together with Stanford professors Stephen Quake and Michael Snyder, demonstrated how the use of new technologies makes it possible based on a blood test among pregnant woman to predict gestational age, due date and preterm birth with high precision. These methods predicts due ...
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