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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.
From Wikipedia, the free encyclopedia. Respiratory acidosis is a medical emergency in which decreased ventilation (hypoventilation) increases the concentration of carbon dioxide in the blood and decreases the blood's pH (a condition generally called acidosis).rom Wikipedia, the free encyclopedia. Respiratory acidosis is a medical emergency in which decreased ventilation (hypoventilation) increases the concentration of carbon dioxide in the blood and decreases the blood's pH (a condition generally called acidosis).