BUN and/or Creatinine Increased: Postrenal Cause
Obstruction originating within the urinary tract:
Benign prostatic hyperplasia (BPH)
Blood clots or sloughed cells
Functional abnormalities of urinary tract.
Obstruction originating outside the urinary tract :
Tumor or mass adjacent to the urinary tract
Suggested Additional Lab Testing
Tests to assess predisposition to form urinary calculi
Tests for infection within the urinary tract
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