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.'