What does the FEV1 value need to be for disqualification due to asthma?

The FEV1 value, or forced expiratory volume in one second, is a critical measurement in assessing lung function and diagnosing respiratory conditions, including asthma. For disqualification related to asthma, the threshold is set at less than 65% of the predicted value. This figure indicates significant compromise in lung capacity, which poses potential risks for the individual during activities that require physical exertion, such as driving a commercial vehicle.

A value lesser than 65% suggests that the individual may not have adequate respiratory function to respond to physical demands effectively, leading to increased vulnerability during stressful situations. The safety of the individual and others on the road is paramount; thus, the 65% cutoff serves as a guideline to ensure only those with sufficient respiratory function are qualified.

It's important to understand that while other percentages might indicate varying severity of dysfunction, the specific threshold for disqualification due to asthma has been determined to be 65%, highlighting the need for careful consideration of lung health in ensuring safety in medical evaluations.