Respiratory acidosis classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Classification

Acute respiratory acidosis

• The PaCO₂ is elevated above the upper limit of the reference range (over 6.3 kPa or 47 mm Hg)
• Accompanied with acidemia (pH <7.35)

Chronic respiratory acidosis

• The PaCO₂ is elevated above the upper limit of the reference range
• Accompanied with a normal blood pH (7.35 to 7.45) or near-normal pH secondary to renal compensation and an elevated serum bicarbonate (HCO₃^- >30 mm Hg).