BUN and/or Creatinine Increased: Postrenal Cause

Differential Diagnosis

Obstruction originating within the urinary tract:

• Congenital anomalies

• Urinary calculi

• Benign prostatic hyperplasia (BPH)

• Infection

• Tumors

• Blood clots or sloughed cells

• Functional abnormalities of urinary tract.

Obstruction originating outside the urinary tract :

• Tumor or mass adjacent to the urinary tract

• Pregnancy

• Uterine prolapse

Suggested Additional Lab Testing

Tests to assess predisposition to form urinary calculi

Tests for infection within the urinary tract