negative base excess

neg·a·tive base ex·cess

a measure of metabolic acidosis, usually predicted from the Siggaard-Andersen nomogram; the amount of strong alkali that would have to be added per unit volume of whole blood to titrate it to pH 7.4 while at 37°C and at a carbon dioxide pressure of 40 mmHg.

neg·a·tive base ex·cess

(neg'ă-tiv bās ek'ses)
A measure of metabolic acidosis; the amount of strong alkali that would have to be added per unit volume of whole blood to titrate it to pH 7.4 while at 37°C and at a carbon dioxide pressure of 40 mmHg.