When the VA rates these conditions, the agency gives one rating for each respiratory condition, and uses the rating that best reflects the patient’s general, overall condition. This test, also known as a stress test, determines how much oxygen is being used by the body when it’s performing at "maximum capacity." This is defined as the greatest amount of physical activity that can be "repeated and sustained" by the patient. He needs to state if there’s an obstruction that’s blocking the patient’s airflow. The results are presented on a graph, but it’s the doctor’s analysis that matters. This test is calculated from the spirometry results and charts the patient’s entire lung capacity-his ability to move air by inhaling completely, exhaling completely, and then inhaling quickly again. This measurement is used to determine the ratio between both the maximum amount of exhaled air and the air blown in one second. This indicates the greatest amount of air you can blow out in a single second.
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