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Interpretation of Stool Electrolytes 4 Test Interpretation Notes Electrolytes (Na, K, Cl) Calculate Stool Osmotic Gap (SOG) 290-[ 2([Na]+[K])] · Secretory type diarrhea SOG · Osmotic type diarrhea SOG >75-100 · If SOG negative, suggests presence of additional anion like phosphate · If [Cl] as high...