LOINC is intended to be included in the HL7 messages in the OBX segment. Do the copied pages in the LIS get distributed through HL7 to the clinicians? There's been limited discussion about assigning LOINC codes to .pdf style reporting. If you can provided de-identified examples of the OBX segments, we may be able to work further on it.
Hope this helps,
Pam Banning, MLS cm(ASCP), PMP
Healthcare Data Analyst
3M Terminology Consulting Services