Blood urea nitrogen (BUN) and Creatinine (Cr) - Pre-renal vs Intra-renal vs Post-Renal Azotemia | Acute Kidney Injury (AKI)- Acute renal failure (ARF) | Kidney Pathology | Nephrology..#nephrology . Acute Renal Azotemia.The term “azot-” means nitrogen (referring to the blood urea nitrogen or BUN). Azotemia means accumulation of nitrogenous waste products in the blood (like urea). Azotemia could be prerenal, intrarenal, or postrenal. Intrarenal azotemia happens because of decreased kidney perfusion (e.g. hypotension, hypovolemic shock). Intrarenal azotemia happens due to toxic damage to the kidney (acute tubular necrosis) or hypoxic damage to the kidney (ischemic nephropathy). Postrenal azotemia is caused by post-renal obstruction (e.g. stones, tumors, benign prostatic hyperplasia).

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