NCIt definition : A unit of mass concentration defined as the concentration of one microgram of a substance
per unit volume of the mixture equal to one deciliter. The concept also refers to
the unit of mass density (volumic mass) defined as the density of substance which
mass equal to one microgram occupies the volume one deciliter.;
Alternative definition : CDISC: A unit of mass concentration defined as the concentration of one microgram
of a substance per unit volume of the mixture equal to one deciliter. The concept
also refers to the unit of mass density (volumic mass) defined as the density of substance
which mass equal to one microgram occupies the volume one deciliter. (NCI);