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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.

Related Calculators


Stool Osmotic/Osmolar Gap Calculator

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

 
   
  



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.