Source:http://linkedlifedata.com/resource/umls/id/C0439277
NCI: A unit of mass concentration defined as the concentration of one picogram 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 a substance which mass equal to one picogram occupies the volume of one deciliter.,NCI: Picograms per deciliter.