Site to NDR-RT MappingSHRINE uses the OWL version of NDF-RT VA Class and VA Product hierarchies for medications data, from the May 12, 2009 NDF-RF XML distribution. The Veterans Administration (VA) Product Component is classified consistently. Any drug or ingredient on the US market has a corresponding VA Product Component. Note that there are numerous ingredients that are not part of drugs on the market, such as reagents or preservatives, which result in occasional classification inconsistencies. For NDR-RT mapping of precise versus base ingredients in RxNorm, base ingredients comprise those without salt. NDF-RT links to base ingredient unless a salt makes a clinical difference, such as Mg Citrate compared with Mg Oxide. |