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The AST/ALT ratio or De Ritis ratio is the ratio between the concentrations of two enzymes, aspartate transaminase (AST) and alanine transaminase, aka alanine aminotransferase (ALT), in the blood of a human or animal. It is used as one of several liver function tests, and measured with a blood test.
= Pearson's cumulative test statistic, which asymptotically approaches a distribution; = the number of observations of type ; = = the expected (theoretical) frequency of type , asserted by the null hypothesis that the fraction of type in the population is ; and = the number of cells in the table.