DOT Certification Practice Exam

What is the minimum required FVC?

1. 60%

2. 65%

3. 70%

4. 75%

The correct answer is: 65%

The minimum required FVC, or Forced Vital Capacity, is an important measure in lung function tests that helps assess a person's respiratory health. A value of 65% indicates that the individual's lung capacity is at least two-thirds of what is expected based on demographic factors such as age, gender, height, and ethnicity. A value of 65% provides a threshold that is significant for determining the presence of restrictive lung disease. Under this criterion, individuals with an FVC below this percentage may be considered to have potential lung impairment, necessitating further evaluation or intervention. Choosing a value lower than 65% would not adequately capture individuals who may already be experiencing significant limitations in lung function. Similarly, values above 65% would be more indicative of healthier lung function but may not address the threshold needed for diagnosing certain conditions. Thus, 65% serves as a crucial benchmark in the assessment of lung function and potential interventions required for individuals whose FVC falls below this level.