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Delta ratio = (change in anion gap)/(change in bicarbonate)
#Nephpearls

< 0.4: Normal AG acidosis
0.4-0.8: Mixed high normal AG acidosis
0.8-2.0: Pure high AG acidosis
> 2.0: High AG acidosis pre-existing metabolic alkalosis

pubmed.ncbi.nlm.nih.gov/17656477/