Common urodynamic tests: (1) Uroflow rate test. (2) Filling cystometry. (3) Urethrogram examination. (4) Simultaneous pressure and flow rate examination. (5) Imaging urodynamic examination. (6)Measurement of bladder work capacity. Significance: (1) Quantitative assessment of urinary status. (2) To clarify the presence and degree of urethral obstruction. (3) To determine bladder function. (4) To provide a basis for the diagnosis of localization of urethral obstruction. (5) To predict whether damage to the upper urinary tract will occur.