I recently had a series of pulmonary function tests and an arterial blood-gas test. My doctor sent me to a pulmonologist who told me I have a high level of CO2 in my blood. What could cause this? I have never smoked, nor do I spend time around smokers. I guess one of the function studies was consistent with this. I am going for a methacholine test and they will repeat the blood gas test as well. Does anyone have any experience with this or know what could be going on?
fitfreak,
Without the benefit of a full history and physical examination, there is no way anyone on this bulletin board can make your diagnosis. Further, it would be irresponsible for someone to attempt to diagnose you over a forum. For some reason, you are seeing a physician, and you should ultimately get your advice and subsequent treatment from that physician.
That written, I will share with you some very basic information about blood gas regulation. In an otherwise healthy individual with elevated CO2 levels, the problem is usually approached by a closer examination of either the pulmonary or renal system.
The lung may be the site of the problem as a function of either V/Q mismatch or shunt. In V/Q mismatch you have lung tissue that is participating in ventilation without the benefit of blood flow to that tissue. Shunt is much more complicated, and it often can involve vascular structures outside of the lung. In very simple terms, shunt is perfusion without ventilation. Now in either case be it V/Q mismatch or shunt, there is inadequate release of CO2 into the respiratory structures. This can lead to an elevated blood CO2 level.
Disorders of renal function that can result in an elevated CO2 level are much more numerous, varied and complicated. Potential causes may include endocrinological, other metabolic, Rx, autoimmune, and etc.
It is also entirely possible that your CO2 retention problem may be due to processes outside of either the lungs or the kidneys. Again, without the benefit of a full history and exam, I cannot begin to discuss with you the etiology of your condition.
Give your physician a chance. Ask him/her what they are thinking regarding a potential diagnosis. Ask your physician to be frank and honest with you.
Best wishes and good luck.
T.D. Wilson, M.D.
Thank you. I’m not looking for an online diagnosis, but just some insight. PM sent.
Thank you. I’m not looking for an online diagnosis, but just some insight.
kinda sounds like it.
No, not really. Just asking if anyone has any experience with this. I’m trying to learn as much as I can. Your comment didn’t provide any insight, though 