Calculates estimated serum osmolality using SI-unit sodium, glucose and urea concentrations.
Formula
value = 2*sodium + glucose + urea
What this calculator does
Calculates estimated serum osmolality using SI-unit sodium, glucose and urea concentrations.
Clinical use
Calculated osmolality is an estimate. Compare with measured osmolality when an osmolal gap is clinically important.
Important limitations
Unit errors involving glucose, urea or BUN can create large calculation errors.
References
- Hughes D et al. Harmonising reference intervals for calculated serum osmolality, anion gap and albumin-adjusted calcium.