During a respiratory assessment, which tool is used to observe breathing patterns?

The stethoscope is a fundamental tool in respiratory assessment, primarily used to auscultate breath sounds and observe breathing patterns. By placing the stethoscope on different areas of the chest and back, healthcare professionals can listen to the sounds made by the air movement in the lungs. This allows them to detect abnormalities, such as wheezing, crackles, or diminished breath sounds, which can indicate various respiratory conditions and help assess the patient's respiratory status.

Other tools mentioned, such as the sphygmomanometer, are used for measuring blood pressure, and the pulse oximeter is primarily for monitoring oxygen saturation levels in the blood. The peak flow meter measures the maximum speed of expiration and is helpful in assessing asthma control but does not directly observe the breathing patterns. Thus, while all tools have their specific purposes in respiratory care, the stethoscope is the appropriate choice for directly observing breathing patterns.