Naegele's rule revisited.

Area of Science:

• Obstetrics and Gynecology
• Medical History

Background:

• Recent literature suggests a misinterpretation of Franz Carl Naegele's rule for estimating the date of delivery, leading to a five-day advancement.
• This revised understanding, supported by Baskett and Nagele's work, is widely cited in obstetrical and midwifery textbooks.

Discussion:

• This study re-examines Naegele's original statements and textbooks to verify the accuracy of the rule's application.
• The re-examination challenges the recent findings, suggesting a deviation from Naegele's original intent.

Key Insights:

• Naegele's original texts clearly indicate that the calculation of the date of delivery should be based on the first day of menstruation.
• The widely accepted five-day adjustment appears to be a misinterpretation of the original rule.

Outlook:

• Clarifying the correct application of Naegele's rule is crucial for accurate gestational age assessment.
• This research may prompt revisions in obstetrical and midwifery educational materials and clinical practice.