Estimates serum osmolality from sodium, glucose and urea — compare with a measured value to derive the osmolar gap.
| Field | Unit | Notes |
|---|---|---|
| Sodium | mEq/L | 100–200 |
| Glucose | mg/dL | 0–2000 |
| Blood urea nitrogen (BUN) | mg/dL | 0–300 |
| Ethanol (optional) | mg/dL | Leave blank if not measured |
Estimates serum osmolality from sodium, glucose and urea — compare with a measured value to derive the osmolar gap.
Sodium (mEq/L), Glucose (mg/dL), Blood urea nitrogen (BUN) (mg/dL), Ethanol (optional) (mg/dL).
Uses US conventional units (glucose & BUN in mg/dL). For SI units use 2×Na + glucose + urea (all mmol/L).
Paediatric estimated GFR using the bedside Schwartz (2009) equation.
Urine anion gap to assess renal NH4+ excretion in normal-anion-gap metabolic acidosis.
Fraction of filtered sodium excreted in urine — helps distinguish prerenal from intrinsic (ATN) acute kidney injury.
Fraction of filtered urea excreted in urine — distinguishes prerenal from intrinsic AKI and stays valid in patients on diuretics.
Estimates the driving force for potassium secretion in the cortical collecting duct — used to work up hyper- and hypokalaemia.
Fraction of filtered magnesium excreted in urine — distinguishes renal magnesium wasting from extrarenal loss in hypomagnesaemia.
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Every tool is suggestion-only. The calculators are deterministic and unit-tested and the AI never invents a dose, but outputs are not a substitute for your training, examination, local protocols, or primary guidelines. Content is provided “as is”, without warranty; verify every value before acting on it.