Nephrology · Emergency Medicine

Calculated Serum Osmolality (2Na + Glucose + BUN) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Osm Full Sodium Mmol L (mmol/L)

Osm Full Glucose Mg Dl (mg/dL)

Osm Full Bun Mg Dl (mg/dL)

Result

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Formula inputs

Osm Full Sodium Mmol L (mmol/L)Accepted range: 100 to 180
Osm Full Glucose Mg Dl (mg/dL)Accepted range: 20 to 800
Osm Full Bun Mg Dl (mg/dL)Accepted range: 1 to 200

Primary source

Smithline N et al. Comparison of measured and calculated serum osmolality. Am J Med Sci. DOI: 10.1097/00000441-197611000-00003. PMID: 1256830. Scope: Calculated serum osmolality (mOsm/kg) = 2×Na + glucose/18 + BUN/2.8 using conventional US units. (1976)

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