Invasive urodynamic studies (UDI) are the gold standard of LUTD diagnosis. UDI is done by the treating physician her or himself or by a designated and dedicated other person. A report and a diagnosis is the ultimate aim of UDI. The report includes information about all relevant events and technical quality and reliability. The report includes also all elements of LUT function measured in relation with limits of normal. Grading and staging of dysfunction and UDI-patterns are reported in standard terms in combination with the patient’s reporting of representativeness and combined with the patient’s symptoms and perceived signs of dysfunction. Finally a urodynamic test report concludes with a urodynamic diagnosis in standard terms.