Naegele's rule
The Naegele rule is a formula for calculating the most likely due date for a human pregnancy, which was named after the Heidelberg gynecologist Franz Naegele (1778–1851).
Naegele's rule
With the standard cycle length of 28 days, the due date is calculated as follows:
Calculated due date = [first day of the last menstrual period] + 7 days - 3 months + 1 year; or: [first day of the last menstrual period] + 9 months + 7 days.
Extended Naegele rule
The extended Naegele rule is used if the cycle length is not equal to 28 days:
Calculated due date = [first day of the last rule] + 7 days - 3 months + 1 year +/- [deviation in days]
Interpretation of the appointment
The Naegele rule provides the day with the greatest probability of birth. However, this is only around four percent. Births to three weeks before and two weeks after that date shall be deemed date of birth , these are about 90 percent. Nine percent are premature births more than three weeks before the calculated date, one percent are carried over births more than two weeks after the calculated date.
Origin of the rule
The origin of the rule can only be reconstructed today. It has been used for around 200 years and is said to have been developed by Franz Naegele. But he never described himself as the inventor. When he wrote the rule in 1812 for the first time in experiences and treatises in the field of diseases of the female sex. In addition to the basics of a methodology of obstetrics mentioned, he refers to Hermann Boerhaave , who already dealt with the duration of pregnancy in 1715. Boerhaave's lectures were edited after his death by Albrecht von Haller , one of his students. These records already contain a calculation rule for calculating the due date. It is still unclear whether Boerhaave already included a week in the addition, this addition could also come from Haller, and whether he was based on the “last day of menstruation” or the “first day of the last period”.
See also
Individual evidence
- ↑ Loytved, C., Bosch, C. Berger, C. & Gutjahr, K. (2009). What did Naegele mean by his rule? Die Midamme 3, 2009, pp. 142–148