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Calculator: Stool osmolal gap

Calculator: Stool osmolal gap

Stool Osm  
Stool Na  
Stool K  

Important: Inputs must be complete to perform calculation.

Decimal precision  



Stool osmolal gap (SOG) interpretation

SOG <50: Compatible with secretory diarrhea
SOG ≥50 and ≤125: Indeterminate
SOG >125: Compatible with osmotic diarrhea


  • Please see appropriate UpToDate topic reviews for further information.
  • Stool Na: stool sodium; Stool K: stool potassium.

Equations used
SOG = Stool_Osm - (2 * (Stool_Na + Stool_K))


Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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Topic 15652 Version 7.0