CPT® Code 94681

The CPT® Code 94681 refers to a specific pulmonary function test that measures oxygen uptake and includes an analysis of expired gases. This procedure is essential for assessing how effectively the lungs are able to take in oxygen during respiration. The test involves the patient inhaling room air through a one-way valve and exhaling into an airtight container, where the expired gases are collected for analysis. The analysis is conducted using an electronic gas analyzer, which determines the concentrations of oxygen (O2) and carbon dioxide (CO2) in the expired air. This process is first performed while the patient is at rest and then repeated during exercise to evaluate the differences in gas exchange under varying levels of physical activity. In addition to measuring oxygen uptake, CPT® Code 94681 includes the determination of CO2 output and the calculation of the percentage of oxygen extracted by the body. This additional data provides a more comprehensive understanding of the patient's respiratory function and efficiency. The results of the test are compiled into a written report by the physician, which outlines the findings and may be used for further clinical decision-making. This procedure is crucial for diagnosing and managing various pulmonary conditions, as it provides insights into the patient's respiratory health and the effectiveness of their lungs in gas exchange.