**Question:** Fowler's method is employed for the measurement of:

A. Blood pressure
B. Heart rate
C. Respiratory rate
D. Blood oxygen saturation

**Core Concept:**
Fowler's method is a technique used to measure respiratory rate, which is the number of breaths taken by a patient in a minute, providing information about the patient's respiratory status and overall health condition.

**Why the Correct Answer is Right:**
Fowler's method is the correct answer because it specifically measures the respiratory rate. This method involves observing the rise and fall of the patient's chest wall over a period of time (usually 60 seconds) and counting the number of breaths taken. The respiratory rate is an important clinical parameter as it helps assess respiratory distress, infection, and other respiratory or systemic issues.

**Why Each Wrong Option is Incorrect:**

A. Blood pressure (Option A) is measured using a sphygmomanometer and auscultation, not Fowler's method.
B. Heart rate (Option B) is measured using pulse palpation or electrocardiography, not Fowler's method.
D. Blood oxygen saturation (Option D) is measured using pulse oximetry, not Fowler's method.

**Clinical Pearl:**
Focusing on the respiratory rate is crucial in clinical practice, as it provides valuable information about the patient's respiratory status and overall health condition. A respiratory rate of 12-20 breaths/minute is considered normal for adults, though infants may have a higher rate (typically 30-60 breaths/minute). Monitoring respiratory rate can help identify conditions like asthma, bronchitis, pneumonia, and sepsis, allowing for early intervention and improved patient outcomes.

**Correct Answer:** C. Respiratory rate