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This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

Stool Osmotic Gap

290 − 2 × (Na + K) in stool water: > 125 osmotic, < 50 secretory

Details

Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.

Frequently asked questions

Stool Osmotic Gap: What does this calculator compute?

Calculates the osmotic gap of stool water (290 − 2 × (Na⁺ + K⁺); Eherer & Fordtran 1992) to distinguish osmotic (> 125 mOsm/kg) from secretory (< 50 mOsm/kg) diarrhea according to the AGA Technical Review 1999; checks for sample contamination (Na + K > 165 mmol/l).

Stool Osmotic Gap: Which sources is this calculator based on?

Eherer AJ, Fordtran JS: Fecal osmotic gap and pH in experimental diarrhea of various causes (Gastroenterology 103:545–551) (1992); Fine KD, Schiller LR; American Gastroenterological Association: AGA Technical Review on the Evaluation and Management of Chronic Diarrhea (Gastroenterology 116:1464–1486) (1999)