Fraction of filtered sodium excreted in urine — helps distinguish prerenal from intrinsic (ATN) acute kidney injury.
| Field | Unit | Notes |
|---|---|---|
| Urine sodium | mEq/L | 0–300 |
| Plasma sodium | mEq/L | 100–200 |
| Urine creatinine | mg/dL | 1–1000 |
| Plasma creatinine | mg/dL | 0.1–30 |
Fraction of filtered sodium excreted in urine — helps distinguish prerenal from intrinsic (ATN) acute kidney injury.
Urine sodium (mEq/L), Plasma sodium (mEq/L), Urine creatinine (mg/dL), Plasma creatinine (mg/dL).
Validated in oliguric AKI. Diuretics, glycosuria, and pre-existing CKD invalidate the prerenal cutoff.
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 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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