Total solute concentration of serum. Calculated osmolality = 2×Na + Glucose + Urea (mmol/L). An osmolal gap >10 suggests unmeasured osmoles (alcohol, methanol, ethylene glycol).
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | 275 – 295 | Adult; calculated vs measured used for osmolal gap |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.