Which assessment would indicate that a woman is in true labor?

UP CHO - 10 September 2021

Obstetrics & Gynaecology

Easy

Appeared in: UP CHO - 10 September 2021

Explanation

True labor is clinically defined by uterine contractions that result in progressive cervical change.
This change involves two processes: dilatation (the opening of the cervical os, measured in centimeters) and effacement (the thinning and shortening of the cervix, measured as a percentage).
The assessment finding of 'Progressive cervical dilatation, 90% effaced' directly describes these definitive changes, confirming that the labor process is underway.
Other signs like contractions or ruptured membranes are only indicative of true labor if they are causing these cervical modifications.

Option A: Rupture of membranes can occur before the onset of true labor, a condition known as Premature Rupture of Membranes (PROM). Without accompanying progressive cervical changes, it is not a definitive sign of labor.
Option C: Engagement of the fetal presenting part (often called 'lightening') can occur several weeks before labor begins, especially in women who are pregnant for the first time (primigravidae). Therefore, it is not a reliable indicator of active labor.
Option D: Contractions that are regular but do not cause cervical change are classified as false labor or Braxton Hicks contractions. True labor contractions increase in frequency, duration, and intensity over time and, most importantly, cause cervical change.

Clinical Relevance

Nursing practice connection: Use the key finding related to Differentiating True vs. False Labor to guide bedside assessment, documentation, and the next nursing action.
Accurately distinguishing true from false labor is a critical nursing skill to ensure timely admission and appropriate care while avoiding unnecessary interventions for women in false labor.
Nurses perform sterile vaginal examinations to assess for cervical dilatation, effacement, and fetal station, which are key components in monitoring labor progress.
Patient education is vital. Nurses should teach expectant mothers the signs of true labor and when to come to the hospital, emphasizing that progressive contractions and other signs should prompt an evaluation.

How to Approach the Question

First, identify the core question: What is the definitive sign of 'true labor'?
Recall the definitions of true versus false labor. The key distinction is the effect of contractions on the cervix.
Analyze each option. Option A (ruptured membranes) can happen before labor. Option C (engagement) can happen weeks before labor. Option D (contractions) describes uterine activity, but doesn't mention its effect.
Option B (progressive cervical dilatation and effacement) directly addresses the physiological changes that define true labor.
Eliminate the options that are not definitive. Ruptured membranes, engagement, and contractions without cervical change can all be part of false labor or the pre-labor period.
Conclude that progressive cervical change is the only assessment that confirms true labor.

Concept Tested & Keywords

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E6 Obstetrics Williams pp. 24-42, 23-42