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Urodynamics is the term used for a set of diagnostic tests that measure lower urinary tract function. A variety of tests may be performed, either alone or in combination. Cystometry is the method by which the pressure-volume relationship of the bladder is measured. It is the principal test used to measure bladder filling a storage function.This article discusses the Indications and contraindications for the urodynamlc evaluation of bladder filling, normal and abnormal findings, and Interpretation of findings. In addition, patient preparation, procedural techniques, electromyographlc activity during bladder filling and storage, and physiologic events and artifacts are addressed.