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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.
Metabolic acidosis occurs when the body produces too much acid, or when the kidneys are not removing enough acid from the body.