CPFT Practice Exam 2025 – Complete Test Prep Guide

During a spirometry test, the most commonly taken measurement is Forced Vital Capacity (FVC). FVC represents the total volume of air that can be forcibly exhaled after taking a deep breath. This measurement is essential in assessing lung function because it provides important information regarding the capacity of the lungs to expel air and the absence of obstructive or restrictive lung diseases.

FVC is often the primary focus in spirometry tests due to its direct correlation with various pulmonary conditions, including asthma and chronic obstructive pulmonary disease (COPD). Healthcare professionals compare the FVC values to predicted normal values based on age, gender, height, and ethnicity to determine if lung function is within normal ranges.

In contrast, the other measurements listed, such as Residual Volume (RV), Inspiratory Capacity (IC), and Functional Residual Capacity (FRC), are important components of lung mechanics, but they are not typically measured during a standard spirometry test. Instead, these measurements are usually obtained through more advanced tests like body plethysmography or gas dilution techniques. Thus, FVC is pivotal in providing a foundational assessment of lung health during spirometry.