CPFT Practice Exam 2026 – Complete Test Prep Guide

The predicted value for Forced Expiratory Volume in 1 second (FEV1) in a healthy adult male, particularly at the age of 70, typically falls within the range of approximately 80-100% of the predicted value when adjusted for height and ethnicity. This range reflects the healthy state and normal functioning of the lungs, taking into account individual variations that can occur due to physical characteristics and demographic factors.

As individuals age, it's common to see some decline in lung function, but healthy seniors still maintain a significant percentage of their predicted lung function. The adjustments based on height and ethnicity are crucial as they influence lung size and overall respiratory capacity, which are critical for accurate assessment of FEV1 values.

In summary, option B correctly identifies the range of what is expected for a normal FEV1 in a healthy 70-year-old male, as it accounts for the factors that determine lung function and acknowledges that healthy adults generally maintain a substantial portion of their predicted lung capacity.