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Recommendation:
Were specimen source (type, source site and collection method) is conveyed in attributes other than the test name, these values should be coded using SNOMED CT.
In particular:

• specimen type terms should be drawn from the 123038009 |Specimen| hierarchy in SNOMED CT
• specimen source site terms should be drawn from the 123037004 |Body structure| hierarchy
• specimen collection method terms should be drawn from the 71388002 |Procedure| hierarchy
  
  
  Explanation:
  Laboratory test names typically include the specimen (e.g. the LOINC "System") upon which the observation was made, but some attributes about the specimen can be carried in other parts of the information or messaging model. Where such other specimen attributes are reported as coded values, they should use SNOMED CT concepts.