Nephrology · Emergency Medicine

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

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

Clinical inputs

Sodium (mmol/L)

mmol/L

Allowed range: 100–180 mmol/L

Glucose (mg/dL)

mg/dL

Allowed range: 20–800 mg/dL

BUN (mg/dL)

mg/dL

Allowed range: 1–200 mg/dL

Result

3 fields remaining

Anyone can run this calculator. Sign in to save, favourite, or send the result.

Ruqelo is AI and can make mistakes. Check important information.

Clinical inputs

Sodium (mmol/L)Accepted range: 100 to 180
Glucose (mg/dL)Accepted range: 20 to 800
BUN (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)

View source