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<h3>
<a name="_Toc252797240">Site to NDR-RT Mapping</a>
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<p>
SHRINE uses the OWL version of <a href="http://bioportal.nci.nih.gov/ncbo/faces/pages/ontology_details.xhtml?ontology_display_name=National%20Drug%20File%20-%20Reference%20Terminology" title="NDR-RT" target="_blank">NDF-RT</a> VA Class and VA Product hierarchies for medications data, from the May 12, 2009 NDF-RF XML distribution.
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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.
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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.
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