NCIt definition : An arbitrary unit of substance content expressed in units of biological activity per
unit of mass equal to one kilogram. Unit per kilogram is also used as a dose calculation
unit expressed in arbitrary units per one kilogram of body mass.;
Alternative definition : CDISC: A unit of substance content expressed in units of biological activity per unit
of mass equal to one kilogram. Unit per kilogram is also used as a dose calculation
unit expressed in arbitrary units per one kilogram of body mass.;