Naegele's rule

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Noun1.Naegele's rule - rule for calculating an expected delivery date; subtract three months from the first day of the last menstrual period and add seven days to that date
principle, rule - a rule or law concerning a natural phenomenon or the function of a complex system; "the principle of the conservation of mass"; "the principle of jet propulsion"; "the right-hand rule for inductive fields"
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Gestational age: Gestational age was calculated from LMP obtained from maternal records using Naegele's rule and confirmed with gestational age assessment by Ballard's scoring.
Now known as Naegele's rule, this remains the standard by which most U.S.
* Gestational age based on LMP using Naegele's rule is uncertain in 20%-40% of cases.