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+The patient is a 63-year-old man presenting to the Emergency Department with a history of acute urinary retention in the past 2 days. Abdominopelvic CT scan revealed a large prostate and a bladder filled with urine. He is a candidate for urethral catheterization and TURP. Further evaluation revealed:
+Post-void residual: 71 mL
+Prostate volume (TRUS): 63 mL
+Prostate-specific antigen (PSA) level: 3.5 ng/mL
+His recent blood chemistry (3 days ago) was normal: 
+Hgb: 13.6 g/dl
+WBC: 133000 /mm3
+Plt: 370000 /ml
+PT: 12 second
+PTT: 34 second
+INR: 0.9
+Creatinine: 0.5 mg/dl
+BUN: 10 mg/dl
+U/A:
+Color: yellow
+Appearance: cloudy
+PH: 5.3
+Specific gravity: 1.010
+Glc: 100
+Nitrite: negative
+Ketone: none
+Leukocyte esterase: negative
+RBC: negative
+WBC: 2 WBCs/hpf
+U/C: negative
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