What is the normal respiratory rate in an adult?

Appeared in: P.CHO-2019

Explanation

The standard reference range for a normal respiratory rate in a resting adult is 12 to 20 breaths per minute (a state known as eupnea).
The option '10-20 breaths/min' is the best choice as it most completely encompasses this standard 12-20 range.
While the lower limit of 10 is slightly below the typical 12, it is a more inclusive and clinically accepted range compared to the other, more restrictive options.

Option A: This range is too narrow and excludes the lower end of the normal adult respiratory rate, which is 12-15 breaths per minute.
Option B: This range includes rates below 12 breaths per minute (i.e., 10 and 11), which are classified as bradypnea (abnormally slow breathing) in adults.
Option D: This range is too narrow and excludes the upper end of the normal adult respiratory rate, which is 17-20 breaths per minute.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal respiratory rate in adults as background academic context rather than a clinical decision trigger.
Respiratory rate is a sensitive indicator of acute clinical deterioration. An accurate count is crucial for patient safety.
When assessing respiration, a nurse must observe not only the rate but also the depth (shallow, normal, deep) and rhythm (regular or irregular) of breathing.
To ensure accuracy, count respirations discreetly after taking the pulse, while your fingers are still on the patient's wrist. This prevents the patient from consciously altering their breathing pattern.

How to Approach the Question

First, identify the core of the question, which is asking for the 'normal respiratory rate' in an 'adult'.
Recall the standard physiological range for this vital sign from your nursing knowledge. The widely accepted range is 12 to 20 breaths per minute.
Examine each of the given options to see which one best aligns with the standard range.
Option A (16-20) is too high on the lower end. Option B (10-14) is too low. Option D (12-16) is too narrow.
Select the option (10-20) that most completely contains the standard 12-20 range, even if it is slightly broader. This makes it the best possible answer among the choices.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 22-24

E6 Nursing Vital Signs p. 63-65

Practise the full P.CHO-2019

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