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The latent phase of labor
Wayne R Cohen1, Emanuel A Friedman2
1Department of Obstetrics and Gynecology, The University of Arizona College of Medicine, Tucson, AZ.
American Journal of Obstetrics and Gynecology
|March 27, 2023
Summary
The latent phase of labor involves cervical changes and can last up to 20 hours in first-time mothers. Prolonged labor may require intervention or indicate other issues.
Area of Science:
- Obstetrics and Gynecology
- Reproductive Medicine
Background:
- The latent phase of labor precedes active labor and involves significant cervical remodeling.
- Cervical changes include softening, thinning, and modest dilation in preparation for active labor.
Purpose of the Study:
- To define the normal duration of the latent phase of labor.
- To identify factors associated with prolonged latent phase.
- To outline management strategies for prolonged latent labor.
Main Methods:
- Literature review and synthesis of existing clinical knowledge on labor progression.
- Analysis of factors contributing to prolonged latent labor.
- Evaluation of management options for prolonged latent phase.
Main Results:
- Normal latent phase duration is approximately 20 hours for nullipara and 14 hours for multipara.
- Prolonged latent phase associated with poor cervical remodeling, analgesia, obesity, and chorioamnionitis.
- About 10% of prolonged latent phase cases are false labor.
Conclusions:
- Clinicians must recognize the extended normal duration of the latent phase.
- Management options include oxytocin augmentation or sedative rest, both effective.
- A very long latent phase may predict other labor dysfunctions.
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