Generated Narrative: NamingSystem W4 Summary Defining URL http://terminology.hl7.org/NamingSystem/W4 Version 2.1.0 Name W4 Title WHO rec# code with ASTM extension Status retired Definition WHO rec# code with ASTM extension Identifiers Type Value Preferred OID 2.16.840.1.113883.6.72 true URI http://terminology.hl7.org/CodeSystem/W4 true