What is the threshold for FVC below which further action should be taken?

The threshold for Forced Vital Capacity (FVC) below which further action should be taken is set at 60%. This value is crucial in the evaluation of pulmonary function during the DOT physical examination. If an individual's FVC falls below this percentage of predicted normal values, it can indicate significant respiratory impairment or potential lung disease.

In such cases, further evaluation, including possibly a referral for more extensive pulmonary testing or a specialist consultation, is typically warranted. Ensuring that respiratory health is adequately assessed is important for the safety of commercial drivers, as any significant impairments can affect their ability to operate a vehicle safely. The thresholds set by regulatory bodies reflect a careful consideration of these health factors.