<s>[INST] A couple things. Just received blood test results and I seem to have a high level of Carbon Dioxide in my blood. I m at 30...range 22-29 mmol/l. Would this be indicative of asthma syptoms? Could burning wood in a fireplace also cause this result? 57 years old female diagnosed with Asthma at 3-about years old. No symptoms since. [/INST] Hello and welcome to Chat Doctor, High levels of carbon dioxide in blood are due to disorders of respiratory system. In case of hyperventilation, there is increased accumulation of carbon dioxide in blood. Asthma can lead to complications associated with respiratory systems. Thus, elevated carbon dioxide can be due to asthma. You need to consult your pulmonologist for clinical assessment, relevant investigations and thus management. Thanks and take care Chat Doctor.  </s>