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Calculate the Fractional Excretion of Sodium (FENa) to help differentiate pre-renal from intrinsic renal causes of acute kidney injury.
Calculate the BUN to Creatinine ratio to help differentiate pre-renal from intrinsic causes of acute kidney injury. Normal ratio is 10–20.
Calculate the free water deficit for hypernatremia correction. Estimates how much free water is needed to normalize serum sodium.
Calculate the urine anion gap to differentiate between GI and renal causes of non-anion gap metabolic acidosis. Essential for RTA workup.
Calculate measured creatinine clearance from a 24-hour urine collection. More accurate than estimated GFR in certain populations.