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Delta Gap is also called Delta Delta. The change in the anion gap divided by the change in the serum bicarbonate.
Normal values default to HCO3 = 24 mEq/L and Anion Gap = 12 mEq/L.

DD Ratio <1.0 = presence of concurrent non AG metabolic acidosis.
DD Ratio >2.0 = presence of concurrent metabolic alkalosis.