excess

excess (ek´ses)

That which is more than the usual or specified amount.
antibody e. in a precipitation test, the presence of antibody in an amount greater than that required to combine with all of the antigen present.
antigen e. 1. in a precipitation test, the presence of uncombined antigen above that required to combine with all of the antibody; precipitation may be inhibited because the presence of excess antigen gives rise to soluble antigen-antibody complexes; 2. in vivo the resultant antigen-antibody interaction in such an antigen e. may give rise to immune complexes, which have a potential to induce cellular damage; such injury underlies the pathologic changes seen in certain immune complex diseases.
base e. a measure of metabolic alkalosis, usually predicted from the Siggaard-Andersen nomogram; the amount of strong acid 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 mm Hg.
convergence e. that condition in which an esophoria or esotropia is greater for near vision than for far vision.
negative base e. 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 mm Hg.

 

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