I don't know what to think. Dr is trying to figure out reason for intermittent hypoxia. My ct scan, pulmonary function tests were normal. Pulmo said overnight oximentary was normal but sleep drs said there were some irregularities. So next I'm having a sleep study done and a stress test that measures heart and lung function while exercising. C02 has 02 were a little off balance with ABG. Chest X-rays show hyperinflation but it didn't show test on the ct scan. Ct scan did show some coronary and pulmonary calcifications but I'm not sure what that indicates yet. This happened 3 years ago and I had a bunch of tests run and they never figured it out.