Bladder outlet obstruction (BOO) is a major urological condition characterized by impedance of urine outflow from the bladder into the urethra. The causes are numerous and commoner in aging males. The result is renal impairment if not addressed promptly. The aim of this study was to highlight the pattern of serum creatinine and urea in our patients population during the period under study and to define any association between the causes of BOO, age of patients and their renal status. One hundred and three (103) case notes were retrieved, twenty (20) did not contain complete investigation results needed for the study and were excluded. Eighty-three (83) patients entered the study with requisite results. Age ranged from 19-93 years with a mean of 61.70 + 11.139 years. Data on clinical history, physical examination, diagnostic and treatment modalities were collected and analysed. Serum creatinine was abnormal in 42.2% and urea in 24.1% of patients. There was neither statistical significant association between the renal status of respondents and causes of BOO nor their renal status and age at diagnosis