Correcting anion gap for albumin

observed anion gap =
= ((sodium in mEq/L) + (potassium in mEq/L)) - ((chloride in mEq/L) + (HCO3 in mEq/L))
corrected anion gap =
= (observed anion gap) + (0.25 * ((normal serum albumin in g/L) - (observed albumin in g/L)) =
= (observed anion gap) + (0.25 * (44 - (observed albumin in g/L))