Urine anion gap to assess renal NH4+ excretion in normal-anion-gap metabolic acidosis.
| Field | Unit | Notes |
|---|---|---|
| Sodium | mEq/L | urine Na |
| Potassium | mEq/L | urine K |
| Chloride | mEq/L | urine Cl |
Urine anion gap to assess renal NH4+ excretion in normal-anion-gap metabolic acidosis.
Sodium (mEq/L), Potassium (mEq/L), Chloride (mEq/L).
Paediatric estimated GFR using the bedside Schwartz (2009) equation.
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.
Estimates serum osmolality from sodium, glucose and urea — compare with a measured value to derive the osmolar gap.
Fraction of filtered magnesium excreted in urine — distinguishes renal magnesium wasting from extrarenal loss in hypomagnesaemia.
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