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Stool Osmolar/Osmotic Gap
Determines if chronic diarrhea is osmotic or secretory in nature.
System of Measurement
US Customary
Metric (SI)
Stool Sodium
(mEq/L)
(mmol/L)
Stool Potassium
(mEq/L)
(mmol/L)
Stool Osm
(mOsm/kg)
(mmol/kg)
Interpretation
Source: Eherer AJ, Fordtran JS. Fecal osmotic gap and pH in experimental diarrhea of various causes.
Gastroenterology
. 1992;103(2):545.
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