What is the primary use of a spirometer?

• A. To improve lung capacity
• B. To measure lung volumes and ventilation patterns
• C. To diagnose lung cancer
• D. To facilitate oxygen therapy

Answer: (B)

The primary use of a spirometer is to measure lung volumes and ventilation patterns. This device provides critical information about how well a person's lungs are functioning by quantifying the amount of air they can inhale and exhale, as well as the rate at which they can do so.

Spirometry is particularly important in diagnosing and monitoring respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other disorders that affect breathing. By assessing various lung volumes—like tidal volume, vital capacity, and forced expiratory volume—healthcare providers can evaluate pulmonary function and make informed treatment decisions.

The other options, while related to lung health, do not accurately represent the primary function of a spirometer. For example, the device is not directly used to improve lung capacity, diagnose lung cancer, or facilitate oxygen therapy. Instead, it serves as a diagnostic tool that provides essential data on lung functionality necessary for managing and treating respiratory conditions.