Osmolar Gap
Difference between measured and calculated serum osmolality.
What this calculator does
This tool compares your measured blood osmolality with a calculated value. A gap between them can suggest the presence of certain substances (e.g. alcohols, other solutes) in the blood.
What your result means
A large gap may warrant further evaluation. The result is used along with your history and other tests. Your care team will interpret what it means in your situation.
This is not medical advice. A healthcare provider should interpret results in your context.
Sodium (mEq/L)
Glucose (mg/dL)
BUN (mg/dL)
Measured osmolality (mOsm/kg)
Key terms
- Osmolar gap
- Difference between measured serum osmolality and calculated osmolality.
- Osmolality
- Concentration of dissolved particles in the blood (mOsm/kg).
Related calculators
- GFR (CKD-EPI)Renal & lab
- GFR (MDRD 4-variable)Renal & lab
- Creatinine Clearance (Cockcroft-Gault)Renal & lab
- Corrected CalciumRenal & lab
- Anion GapRenal & lab
- Corrected Sodium (Hyperglycemia)Renal & lab
- BMI CalculatorBody & metabolic
- BSA Calculator (Mosteller)Body & metabolic
This tool is for educational and reference use only. It does not constitute medical advice. Always consult a healthcare professional for medical decisions.