Ace the CPFT Challenge 2025 – Breathe Easy with Pulmonary Success!

The normal range for Forced Expiratory Volume in one second (FEV1) as a percentage of Forced Vital Capacity (FVC) in healthy adults is typically around 70-80%. This ratio, often referred to as the FEV1/FVC ratio, is a key indicator used in pulmonary function testing to evaluate lung function. A ratio within this range suggests that the lungs are functioning well, enabling an efficient expulsion of air during the first second of a forced expiration.

In healthy individuals, the FEV1 should be a significant portion of the total forced vital capacity because the airways should remain open during exhalation, allowing for adequate flow. Values lower than 70% may indicate an obstructive pattern, where airflow is impeded, which is common in conditions like asthma or chronic obstructive pulmonary disease (COPD).

Therefore, the correct answer emphasizes the importance of recognizing the 70-80% range as a standard benchmark for healthy lung function, critical for diagnosing various respiratory conditions and monitoring lung health over time.