What is the normal range for forced vital capacity (FVC) in adult males?

The normal range for forced vital capacity (FVC) in adult males is indeed 4.5 to 6.0 liters. FVC measures the maximum amount of air that a person can forcefully exhale after taking a deep breath, and it is an important parameter used in pulmonary function tests to assess lung capacity and function. Variations in normal ranges can occur based on factors such as age, height, and ethnicity, but the value of 4.5 to 6.0 liters is widely accepted as a standard range for healthy adult males.

This range indicates that individuals with an FVC within these parameters are likely to have normal lung function. Values outside of this range might suggest the presence of restrictive or obstructive lung diseases, depending on whether the FVC is too low or abnormally high compared to predicted values for the individual's demographic.