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Normal labor: mechanism and duration.

John B Liao1, Catalin S Buhimschi, Errol R Norwitz

  • 1Division of Reproductive Sciences, Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.

Obstetrics and Gynecology Clinics of North America
|May 19, 2005
PubMed
Summary
This summary is machine-generated.

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This article explains normal term labor, focusing on its onset, progress, and mechanics. It defines term labor as occurring between 37 and 42 weeks of gestation.

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine

Background:

  • Pregnancy duration typically averages 40 weeks from the last menstrual period.
  • Term labor is defined as occurring between 37.0 and 42.0 weeks of gestation.

Purpose of the Study:

  • To detail the physiological events of normal term labor.
  • To describe the onset, progression, and biomechanics of term labor.

Main Methods:

  • Review of established physiological processes.
  • Focus on normal labor parameters within the term gestational period.

Main Results:

  • Normal labor involves a sequence of physiological events facilitating fetal delivery.
  • Term pregnancy spans 37 to 42 weeks, with a mean duration of 40 weeks.

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Conclusions:

  • Understanding normal term labor mechanics is crucial for obstetric care.
  • This article specifically addresses term labor, excluding preterm and postterm conditions.