I received the results of my lung function test yesterday. I passed with above average to average scores, with one exceptions. My DLCO was low @ 66% average being 29.00 and I scored a 19.12. The doctor said I'm good no lung problems at this time but can't explain or understand why I'm having shortness of breath on exertion. I have pneumonia back in May 2012 and it was pretty bad. The doctor missed it for 2 months prior to catching it on May. Now wants to send me to the Cardio doctor to talk about the right ventricle heart test. Doctor said he doesn't think the Cardio will agree that more testing is necessary as he doesn't think so either. But covering is back side since he dropped the ball on pneumonia. So my question is what does it mean to have a low DLCO test result and your opinion on the right ventricle test? Confused here a bit. My echo and EKG both were ok back in January 2012.