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Respiratory acidosis occurs when the arterial partial pressure of carbon dioxide (Pa CO2) is elevated above the normal range (>44 mm Hg) leading to a blood pH lower than 7.35.By definition, the diagnosis of respiratory acidosis requires measurement of Pa CO2 and pH. When the diagnosis is made, the underlying cause should be thoroughly investigated.
The following medical conditions are some of the possible causes of Respiratory acidosis. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Chronic obstructive pulmonary disease. 2  Emphysema. 3  Severe asthma. 4  Chronic bronchitis. 5  Neuromuscular diseases.