Todefine the use of Prostate Specific Antigen (PSA) as a predictor of prostate volume in catheterized BPH patient. Data were collected from medical record of symptomatic BPH patients who underwent prostate biopsy at Cipto Mangunkusumo Hospital Urology Clinic since 1994 until 2006. Data of age, serum PSA, indwelling catheter, maximal flow, urine residue, and prostate volume were recorded as vari…