CPT® Code 94690

The CPT® Code 94690 refers to a specific pulmonary function test that measures oxygen uptake through an expired gas analysis conducted at rest. This procedure is essential for assessing how effectively the lungs are able to take in oxygen during normal breathing. In this test, the patient inhales room air through a one-way valve and subsequently exhales into an airtight container. The gases that are exhaled are collected and analyzed using an electronic gas analyzer, which determines the concentrations of oxygen (O2) and carbon dioxide (CO2) present in the expired air. This analysis provides valuable insights into the respiratory function of the patient. Unlike other related procedures, such as CPT® Code 94680, which measures oxygen uptake during both rest and exercise, CPT® Code 94690 focuses solely on the assessment of oxygen uptake at rest. It is important to note that this procedure is performed indirectly, utilizing arterial puncture to obtain blood samples for gas analysis, rather than directly measuring the expired gases. The results of this test are crucial for physicians in diagnosing and managing various pulmonary conditions, as they provide a clear picture of the patient's respiratory efficiency at rest.