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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]
For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...
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).
Without knowing the date of a patient’s last menstrual period, it can be hard to determine where they are in their cycle. Liesel Teen, a labor and delivery nurse and founder of Mommy Labor Nurse
Furthermore, actual childbirth has only a certain probability of occurring within the limits of the estimated due date. A study of singleton live births came to the result that childbirth has a standard deviation of 14 days when gestational age is estimated by first trimester ultrasound, and 16 days when estimated directly by last menstrual period.
The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 35 days in adults. [2] [3] The average length is 28 days; one study estimated it at 29.3 days. [10]
Postterm – ≥ 42 weeks + 0 days of gestation (> 293 days from the first day of last menstrual period, or > 13 days from the estimated due date) Late term – 41 weeks + 0 days to 41 weeks + 6 days of gestation; Full term – 39 weeks + 0 days to 40 weeks + 6 days of gestation; Early term – 37 weeks + 0 days to 38 weeks + 6 days of gestation
Last menstrual period, see Gestational age, the first day of the menstrual period prior to conceiving, used to calculate expected date of delivery; Last mile provider, provider of the final leg of a telecommunications network terminating at the subscriber's premises; Lighting Management Plan, in the context of resolving light pollution, inter alia
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