The normal length of the umbilical cord is between?

Appeared in: MNS 2024

Explanation

The normal length of the umbilical cord at term is defined as the range between 30 cm and 100 cm.
The average length is typically cited as being between 50 and 60 cm.
This length is optimal as it allows for adequate fetal movement within the uterus without posing a high risk of entanglement or being too short to allow for descent during labor.

Option A: A cord length of 10-25 cm is considered an abnormally short cord (less than 30 cm).
Option C: A cord length of 105-120 cm is considered an abnormally long cord (greater than 100 cm).
Option D: A cord length of 125-140 cm is also considered an abnormally long cord.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal umbilical cord length as background academic context rather than a clinical decision trigger.
During labor, nurses monitor the fetal heart rate for variable decelerations, which can be a sign of umbilical cord compression. This risk is heightened with both very long and very short cords.
Post-delivery, the nurse inspects the placenta and umbilical cord for abnormalities, including its length, the presence of knots, and the standard count of two arteries and one vein (AVA).
What if? - If a true knot is found in the cord after delivery, it is a significant finding. The nurse should document it and recognize that it could have been the cause of intermittent fetal distress during labor, as tightening of the knot can temporarily occlude blood flow.

How to Approach the Question

Identify the core of the question, which asks for the normal range of the umbilical cord's length.
This is a factual recall question based on standard obstetric knowledge.
Recall the established physiological range. The average is around 50-60 cm, but the normal range is much broader.
Evaluate the given options to find the one that correctly brackets the accepted normal range.
The range of 30-100 cm is the standard accepted value. Eliminate options that represent abnormally short or long cords.

Concept Tested & Keywords

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E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 53-64

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1141-1143

Practise the full MNS 2024

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