This International Standard is applicable to medical diagnostic ultrasonic equipment. – It provides a set of traceable acoustic parameters describing the acoustic fields. – It defines a standard means and format for the reporting of the acoustic output information. – It also describes a reduced dataset recommended for equipment generating low acoustic output levels. NOTE The information tabulated in this standard format can be used for a) exposure planning for biological effects studies; b) exposure data for prospective epidemiological studies conducted using exposure conditions similar to those reported in this standard. In the absence of actual exposure data for retrospective epidemiological studies, the information tabulated in this standard format might also be used with cautionary comment.