Criteria For Tissue Invasion

Clinical

Kidney or prostate infection is marked by fever over 38°C, chills, and pain. The patient appears acutely ill. Laboratory

Tissue invasion is invariably accompanied by an erythrocyte sedimentation rate over 20 mm/h and serum C-reactive protein levels over 2.0 mg/dL. Blood cultures grow in 30%—50% of cases, which in an immunocompetent host indicates simply bacteremia, not septicemia. This reflects easy permeability between the urinary and the venous compartments of the kidney. Imaging

When indicated, ultrasound imaging, tomodensitometry, and scintigraphy provide objective evidence of pyelonephritis. In case of vesicoureteral reflux, urinary tract infection necessarily involves the upper urinary tract.

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