ney limits ability to clear creatinine

Urine sodium

20-40 mEq/L

Prerenal: <20 mEq/L Intrarenal: <20 mEq/L Postrenal: >40 mEq/L

Prerenal and sometimes intrarenal leads to sodium retention whereas postrenal leads to sodium loss in urine

Other Tests: Complete blood count; erythrocyte sedimentation rate; hemodynamic

monitoring; renal ultrasound; radionuclide scanning; magnetic resonance angiography;

renal biopsy; serum levels of sodium, potassium, magnesium, and phosphorus; arterial

blood gases

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