CPT® Code 94726

Lung volume plethysmography is a diagnostic procedure utilized to assess the maximum volume of air that the lungs can accommodate. This test is conducted within a specialized environment known as a body box, which is an airtight chamber designed to ensure accurate measurements. During the procedure, the patient is equipped with nasal clips to obstruct airflow through the nostrils, thereby directing all inhalation and exhalation through the mouthpiece. The patient is instructed to breathe normally or pant into an open mouthpiece, allowing for the measurement of lung volumes. If the assessment includes airway resistance, the patient will then use a closed mouthpiece for further measurements. The procedure relies on the principles of pressure changes within the body box, which are correlated with the patient's chest movements during breathing. These variations in pressure and air volume enable healthcare providers to derive critical data regarding lung capacity and airway resistance. Following the completion of the test, the physician interprets the results and compiles a comprehensive written report detailing the findings, which can be essential for diagnosing and managing various pulmonary conditions.