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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.
Respiratory acidosis is a condition that occurs when the lungs cannot remove all of the carbon dioxide the body produces. This causes body fluids, especially the blood, to become too acidic. Causes of respiratory acidosis include: 1  Diseases of the airways (such as asthma and chronic obstructive lung disease)  Diseases of the chest (such as scoliosis)