For nasogastric intubation, the length of NG tube should be measured from the?

Appeared in: UPRVUNL - 2021

Explanation

The correct procedure for estimating the required length of a nasogastric tube is the traditional NEX method.
NEX is an acronym for Nose-Earlobe-Xiphoid process, which are the three anatomical landmarks used for the measurement.
The first step is to measure from the tip of the nose to the tragus of the ear.
The second step is to measure from the tragus of the ear down to the xiphoid process (the inferior tip of the sternum).
This total distance estimates the length required for the tube's tip to properly reach the stomach.

Option A: Measuring from the nose directly to the sternum is an incomplete and inaccurate method. It omits the path through the nasopharynx (approximated by the earlobe landmark) and would result in the tube being too short, likely terminating in the esophagus.
Option B: Measuring from the nose to the umbilicus is incorrect for gastric placement. This measurement would be far too long, causing the tube to coil in the stomach or advance into the small intestine.
Option C: This option describes an illogical and non-standard combination of landmarks. It incorrectly combines parts of different measurement techniques and would result in a grossly inaccurate length.

Clinical Relevance

Nursing practice connection: Knowing Measurement technique for nasogastric (NG) tube insertion helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Correct measurement is a critical patient safety step. An NG tube that is too short can lead to the administration of feeds or medications into the esophagus, causing aspiration pneumonia, which can be fatal.
An excessively long tube can coil in the stomach, leading to blockages, or advance into the duodenum, which may not be the intended site for decompression or feeding.
Always confirm tube placement as per facility policy before the first use. The gold standard is a radiographic (X-ray) confirmation.

How to Approach the Question

This is a procedural recall question that tests your knowledge of a standard nursing skill.
First, identify the core procedure from the question stem: measuring a nasogastric (NG) tube.
Recall the standard mnemonic or method for this procedure. The most common is NEX: Nose-Earlobe-Xiphoid.
Systematically evaluate each option against the NEX landmarks.
Option A (Nose to sternum) is missing the 'E' (Earlobe).
Option B (Nose to umbilicus) uses an incorrect final landmark for gastric placement.

Concept Tested & Keywords

QzloBlvE6k-ssxs8U4v75Q

E6 Nursing Fundamentals Potter Perry 12e Part 6 p. 53-55

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 216-218

E6 Nursing Fundamentals Taylor p. 670-672

Practise the full UPRVUNL - 2021

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