CPT® Code 94250

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Expired gas collection is a diagnostic procedure that involves the measurement of gases exhaled by a patient to assess respiratory function. This procedure utilizes a specialized testing device that includes a breathing mouthpiece and tubing, which is connected to an airtight collection container, commonly referred to as a Douglas bag. The design of the tubing incorporates a one-way valve, enabling the patient to inhale ambient air while exhaling the gases present in their lungs directly into the airtight container. This process is conducted over a specified duration, allowing for the collection of expired gases. Once the collection period concludes, a sample of the expired gas is analyzed to determine the concentrations of oxygen (O2) and carbon dioxide (CO2) using an electronic gas analyzer. Additionally, the concentrations of O2 and CO2 in the ambient air are measured. The results from the expired gas collection are then compared to evaluate key respiratory metrics, specifically the oxygen uptake (VO2) and the rate of carbon dioxide elimination (VCO2), which are critical for understanding a patient's respiratory efficiency and overall pulmonary function.