The diameter of the cervical canal after complete dilation is?

Appeared in: HPSSC - 2015

Explanation

Complete cervical dilation, which marks the end of the first stage of labor, is defined as 10 centimeters.
This diameter is necessary to allow the passage of the fetal head, which has an average biparietal diameter of about 9.5 cm.
Reaching 10 cm of dilation signifies the beginning of the second stage of labor, also known as the pushing stage.

Option A: This is an incorrect value. The standard measurement for complete cervical dilation is 10 cm, and it is not measured beyond this point.
Option C: This measurement indicates the late active phase of the first stage of labor. While close to complete, the cervix still needs to dilate further before the second stage begins.
Option D: This measurement is now considered the threshold for the beginning of the active phase of labor, not complete dilation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of complete cervical dilation during labor as background academic context rather than a clinical decision trigger.
Accurate assessment of cervical dilation is a fundamental nursing skill used to monitor labor progress, determine the stage of labor, and guide interventions such as analgesia and labor augmentation.
When a patient reaches 10 cm, the nurse's priority shifts to preparing for delivery, instructing the patient on effective pushing techniques, and intensifying maternal and fetal monitoring.
What if? If a patient is 10 cm dilated but the fetal head remains high in the pelvis (e.g., -2 station), it could signal a problem like cephalopelvic disproportion (CPD). The nurse must notify the provider immediately, as this situation may necessitate an operative vaginal delivery or a cesarean section.

How to Approach the Question

This is a factual recall question asking for a standard definition in obstetrics.
Identify the key phrase in the question: 'complete dilation'.
Recall the stages of labor. The first stage ends when the cervix is 'fully' or 'completely' dilated.
Access your knowledge of standard obstetric measurements. The universally accepted diameter for complete dilation is 10 cm.
Evaluate the other options in the context of labor progression: 6 cm is the start of active labor, and 8 cm is late active labor. 12 cm is not a standard measurement.

Concept Tested & Keywords

QWHRf1pCImTUxVP-dlJWtc

E6 Obstetrics Williams p. 24-42

Practise the full HPSSC - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.