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Forty percent of children are referred to outpatient clinics because of lower urinary tract disorders, and complete emptying of the bladder is important in preventing urinary tract infections and stone formation. Thirty-two boys in this study voided in sitting and standing positions, and uroflowmetric and ultrasound measurements of their PVR urine were compared between the two groups. Except for EMG activity, voiding position seems not to affect uroflowmetric parameters and PVR urine. Outcomes of this study suggest both voiding positions can be used as an alternative voiding position of each other.