Anion Gap: --Na+ & K+ together accounts for 95% of cations and Cl- ,HCO3- accounts for 86% of anions. --commonly only these electrolytes are measured but there is always a difference between measured cations & measured anions -- the unmeasured anions like sulfates, phosphates, organic acids contribute to the anion gap. -- Calculation of anion gap - Difference between (Na+ + K+) & (HCO3- + Cl-) --Normal anion gap is about 12mmol/l 2 types of anion gap 1.High Anion Gap Metabolic acidosis(HAGMA) -- acidosis along with increased anion gap is called as high anion gap metabolic acidosis -- Causes of HAGMA are Lactic Acidosis , Diabetic Keto acidosis 2.Normal Anion Gap Metabolic Acidosis(NAGMA) --when there loss of both anions & cations the anion gap is normal but acidosis may be present and it is called as normal anion gap metabolic acidosis - -Causes of NAGMA are - Diarrhea, Renal Tubular Acidosis
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