Specimen Source Site Modifier

The use of this attribute is to modify, qualify or further specify, the entity described by SPM-8 _ Specimen Source Site. This is particularly useful when the code set used in SPM-8 does not provide the precision required to fully describe the site from which the specimen originated. For example, if the specimen source site was precisely described as _left radial vein_ but the code set employed only provided _radial vein,_ this attribute could be employed to add the modifier _left._