Endocrinology · Emergency Medicine
Effective Serum Osmolality (Tonicity) calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Result
Complete all required inputs to calculate the score.
Formula inputs
- Measured serum sodium (mmol/L)Accepted range: 50 to 250
- Serum glucose (mg/dL)Accepted range: 0 to 3000
Primary source
Kitabchi AE et al. Hyperglycemic crises in adult patients with diabetes. Diabetes Care. DOI: 10.2337/dc09-9032. PMID: 19564476. Scope: effective serum osmolality in adult hyperglycemic crises, excluding BUN because urea is an ineffective osmole. (2009)
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