Source:http://linkedlifedata.com/resource/umls/id/C0439423
NCI: A unit of mass flow rate equivalent to the rate at which one thousandth of a gram of matter crosses a given surface or is delivered to a given object or space over a period of time equal to twenty four hours. Milligram per twenty four hours is also a dose administration rate unit equal to the rate at which one thousandth of a gram of a product is administered per unit of time equal to twenty four hours.,NCI: A unit of measure referring to the ratio between mass expressed in milligrams per day.(NCI)