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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.
Compare the lab results with the normal values. In respiratory acidosis, the increased carbon dioxide is the primary cause for the other lab results. Increased CO2 causes the equilibrium to shift right increasing H2CO3, H+ and HCO3-. Increased H+ ion leads to decreased pH, (7.l5) from normal 7.4.