base excess

base excess
the deviation from normal of the concentration of titratable base when blood or plasma is titrated to a plasma pH of 7.40 at a pCO2 of 40 mm Hg at 37°C; it is 1.2 times the deviation of the standard bicarbonate from normal. Positive values indicate metabolic alkalosis; negative values, metabolic acidosis.

Medical dictionary. 2011.

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