The tests that are needed to diagnose overactive bladder are laboratory tests, special urologic tests, and invasive urodynamic tests. Overactive bladder is a syndrome characterized by urinary urgency, and patients need to undergo screening tests to rule out other pathologies before making a diagnosis. Routine urinalysis and urine culture are feasible in laboratory tests to exclude pathogenic infections. In older men, serum PSA can be performed, except for prostate cancer. Among the special urologic tests are uroflowmetry, urinary ultrasound, etc., which are used to exclude bladder outlet obstruction. Invasive tests such as urodynamics can determine the presence of lower urinary tract obstruction and assess the function of the urethral muscles. There are also cystoscopy etc. These are just some of the tests that need to be performed to diagnose overactive bladder, and specific tests need to be prescribed by a specialized doctor according to the patient’s condition.