Osmolar gap Calculation

Stool osmotic/osmolar gap is a calculation performed to distinguish among different causes of diarrhea. This calculator gives you the result whether it is osmotic diarrhea or secretory diarrhea.A low stool osmolal gap can imply secretory diarrhea, while a high gap can imply osmotic diarrhea.

Stool Osmotic/Osmolar Gap Calculator

Stool Sodium (mOsm/kg)
Stool Potassium (mOsm/kg)
Stool osmotic gap(Sg)

Stool osmotic/osmolar gap is a calculation performed to distinguish among different causes of diarrhea. This calculator gives you the result whether it is osmotic diarrhea or secretory diarrhea.A low stool osmolal gap can imply secretory diarrhea, while a high gap can imply osmotic diarrhea.

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Osmotic Gap Formula:

Sg = 290 mOsm/kg-2*(Na+ + K+) Osmolality: ~290 mOsm/kg Na+: ~30 mmol/L K+: ~75 mmol/L

Stool Osmolar Calculation gives you the results of osmotic gap.

Note :This statistics calculator is presented for your own personal use and is to be used as a guide only. Medical and other decisions should NOT be based on the results of this calculator. Although this calculator has been tested, we cannot guarantee the accuracy of its calculations or results.


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