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RpH versus [H+]. The relationship of the ratio of PCO2 to [HCO3–] (RpH) to [H+] () is linear and derived from the Henderson equation, [H+]=24×(PCO2/[HCO3–]). [H+], hydrogen ion concentration [H+] (nM); [HCO3–], bicarbonate concentration (mM); PCO2, partial pressure of carbon dioxide (mm Hg).
