What level of lung function is considered a contraindication for surgery?

Generally, when the percentage of predicted forced expiratory volume in one second (FEV1) is below 60% or the forced vital capacity (FVC) is significantly reduced, it may constitute a contraindication for surgery. If there are concerns, it is recommended to seek medical advice in advance. The detailed analysis is as follows:

Pulmonary function parameters are key indicators for assessing surgical risk. When core indices fall below the aforementioned thresholds, this indicates impaired ventilation and gas exchange functions, increasing the risks of respiratory failure, infections, and other complications during anesthesia and postoperative recovery—especially in thoracic surgeries or prolonged procedures.

However, these are not absolute contraindications. A comprehensive evaluation must consider the type of surgery and the patient’s overall health status. Some patients may improve their lung function through preoperative optimization or opt for less invasive surgical approaches to reduce risks.

Comprehensive pulmonary function testing should be completed before surgery, with risk assessment conducted by a qualified physician. Do not self-assess. Follow postoperative instructions for respiratory rehabilitation exercises to support recovery.