Osmolality Calculator
Laboratory Values*
mmol/L
Osmolal Gap (Optional)
mOsm/kg
Results
Awaiting calculation
Dog reference: 290 to 310 mOsm/kg
Requires sodium, glucose and urea
Awaiting calculation
Normal: <10 mOsm/kg
Requires all laboratory values and measured osmolality
Formula Used:
2 × Na + glucose (mmol/L) + urea (mmol/L)
Conventional units: 2 × Na + glucose (mg/dL) ÷ 18 + BUN (mg/dL) ÷ 2.8
This calculator is intended as a guide for use by veterinary professionals only. It is not a substitute for professional interpretation, diagnosis, or treatment. Calculations may not be accurate for all individuals or circumstances. Always use professional judgement and verify all calculations before use in clinical practice.