<qa>  What is BUN 50 greater than normal?6. Presence of severe renal disease BUN 50 greater than normal. Patients must have evidence from their PCP or Urologists of normal PSA and urodynamic tests within the last 12 months; patients with BUN 50 greater than normal 5 to 20 mg d L or creatinine 50 greater than normal 0 .7 and 1.4 mg d L will be excluded. Labs will be requested from PCP. 