| Relation Name/Additional Label | Expanded Form | Count |
| CHD/isa | has child relationship in a Metathesaurus source vocabulary /Is a | 46252 |
| PAR/inverse_isa | has parent relationship in a Metathesaurus source vocabulary /Inverse is a | 46252 |
| RO/replaces | has relationship other than synonymous, narrower, or broader/Replaces | 4128 |
| RO/replaced_by | has relationship other than synonymous, narrower, or broader/Replaced by | 4128 |
| RO/has_finding_site | has relationship other than synonymous, narrower, or broader/Has finding site | 4008 |
| RO/finding_site_of | has relationship other than synonymous, narrower, or broader/Finding site of | 4008 |
| RO/has_life_circumstance | has relationship other than synonymous, narrower, or broader/Has life circumstance | 3018 |
| RO/life_circumstance_of | has relationship other than synonymous, narrower, or broader/Life circumstance of | 3018 |
| RO/has_associated_morphology | has relationship other than synonymous, narrower, or broader/Has associated morphology | 2913 |
| RO/associated_morphology_of | has relationship other than synonymous, narrower, or broader/Associated morphology of | 2913 |
| RO/has_active_ingredient | has relationship other than synonymous, narrower, or broader/Has active ingredient | 1192 |
| RO/active_ingredient_of | has relationship other than synonymous, narrower, or broader/Active ingredient of | 1192 |
| RB/has_part | has a broader relationship/Has part | 1137 |
| RN/part_of | has a narrower relationship/Part of | 1137 |
| RO/is_interpreted_by | has relationship other than synonymous, narrower, or broader/Is interpreted by | 981 |
| RO/interprets | has relationship other than synonymous, narrower, or broader/Interprets | 981 |
| RO/pathological_process_of | has relationship other than synonymous, narrower, or broader/Pathological process of | 926 |
| RO/has_pathological_process | has relationship other than synonymous, narrower, or broader/Has pathological process | 926 |
| RO/has_causative_agent | has relationship other than synonymous, narrower, or broader/Has causative agent | 754 |
| RO/causative_agent_of | has relationship other than synonymous, narrower, or broader/Causative agent of | 754 |
| RO/has_method | has relationship other than synonymous, narrower, or broader/Has method | 500 |
| RO/method_of | has relationship other than synonymous, narrower, or broader/Method of | 500 |
| RO/laterality_of | has relationship other than synonymous, narrower, or broader/Laterality of | 432 |
| RO/has_laterality | has relationship other than synonymous, narrower, or broader/Has laterality | 432 |
| RO/role_played_by | has relationship other than synonymous, narrower, or broader/Role played by | 339 |
| RO/plays_role | has relationship other than synonymous, narrower, or broader/Plays role | 339 |
| SY/same_as | source asserted synonymy./Same as | 266 |
| RO/has_interpretation | has relationship other than synonymous, narrower, or broader/Has interpretation | 264 |
| RO/interpretation_of | has relationship other than synonymous, narrower, or broader/Interpretation of | 264 |
| RO/occurs_in | has relationship other than synonymous, narrower, or broader/Occurs in | 252 |
| RO/has_occurrence | has relationship other than synonymous, narrower, or broader/Has occurrence | 252 |
| RO/physiologic_state_of | has relationship other than synonymous, narrower, or broader/Physiologic state of | 250 |
| RO/has_physiologic_state | has relationship other than synonymous, narrower, or broader/Has physiologic state | 250 |
| RO/has_count_of_base_of_active_ingredient | has relationship other than synonymous, narrower, or broader/Has count of base of active ingredient | 229 |
| RO/count_of_base_of_active_ingredient_of | has relationship other than synonymous, narrower, or broader/Count of base of active ingredient of | 229 |
| RO/has_direct_procedure_site | has relationship other than synonymous, narrower, or broader/Has direct procedure site | 215 |
| RO/direct_procedure_site_of | has relationship other than synonymous, narrower, or broader/Direct procedure site of | 215 |
| RO/possibly_equivalent_to | has relationship other than synonymous, narrower, or broader/Possibly equivalent to | 202 |
| RO/has_direct_substance | has relationship other than synonymous, narrower, or broader/Has direct substance | 116 |
| RO/direct_substance_of | has relationship other than synonymous, narrower, or broader/Direct substance of | 116 |
| RO/cause_of | has relationship other than synonymous, narrower, or broader/Cause of | 105 |
| RO/due_to | has relationship other than synonymous, narrower, or broader/Due to | 105 |
| RO/has_specimen_source_topography | has relationship other than synonymous, narrower, or broader/Has specimen source topography | 105 |
| RO/specimen_source_topography_of | has relationship other than synonymous, narrower, or broader/specimen source topography of | 105 |
| RO/has_specimen_substance | has relationship other than synonymous, narrower, or broader/Has specimen substance | 86 |
| RO/specimen_substance_of | has relationship other than synonymous, narrower, or broader/Specimen substance of | 86 |
| RO/occurs_after | has relationship other than synonymous, narrower, or broader/Occurs after | 85 |
| RO/occurs_before | has relationship other than synonymous, narrower, or broader/Occurs before | 85 |
| RO/component_of | has relationship other than synonymous, narrower, or broader/Component of | 84 |
| RO/has_component | has relationship other than synonymous, narrower, or broader/Has component | 84 |
| RO/associated_with | has relationship other than synonymous, narrower, or broader/Associated with | 66 |
| RO/disposition_of | has relationship other than synonymous, narrower, or broader/Disposition of | 50 |
| RO/has_disposition | has relationship other than synonymous, narrower, or broader/Has disposition | 50 |
| RO/definitional_manifestation_of | has relationship other than synonymous, narrower, or broader/Definitional manifestation of | 47 |
| RO/has_definitional_manifestation | has relationship other than synonymous, narrower, or broader/Has definitional manifestation | 47 |
| RO/clinical_course_of | has relationship other than synonymous, narrower, or broader/Clinical course of | 42 |
| RO/has_clinical_course | has relationship other than synonymous, narrower, or broader/Has clinical course | 42 |
| RO/has_indirect_procedure_site | has relationship other than synonymous, narrower, or broader/Has indirect procedure site | 36 |
| RO/indirect_procedure_site_of | has relationship other than synonymous, narrower, or broader/Indirect procedure site of | 36 |
| RO/has_procedure_site | has relationship other than synonymous, narrower, or broader/Has procedure site | 34 |
| RO/has_realization | has relationship other than synonymous, narrower, or broader/Has realization | 34 |
| RO/procedure_site_of | has relationship other than synonymous, narrower, or broader/Procedure site of | 34 |
| RO/realization_of | has relationship other than synonymous, narrower, or broader/Realization of | 34 |
| RO/has_specimen_procedure | has relationship other than synonymous, narrower, or broader/Has specimen procedure | 31 |
| RO/specimen_procedure_of | has relationship other than synonymous, narrower, or broader/Specimen procedure of | 31 |
| RO/has_direct_morphology | has relationship other than synonymous, narrower, or broader/Has direct morphology | 29 |
| RO/direct_morphology_of | has relationship other than synonymous, narrower, or broader/Direct morphology of | 29 |
| RO/direct_device_of | has relationship other than synonymous, narrower, or broader/Direct device of | 27 |
| RO/moved_to | has relationship other than synonymous, narrower, or broader/Moved to | 27 |
| RO/moved_from | has relationship other than synonymous, narrower, or broader/Moved from | 27 |
| RO/has_direct_device | has relationship other than synonymous, narrower, or broader/Has direct device | 27 |
| RO/device_used_by | has relationship other than synonymous, narrower, or broader/Device used by | 26 |
| RO/uses_device | has relationship other than synonymous, narrower, or broader/Uses device | 26 |
| RO/specimen_of | has relationship other than synonymous, narrower, or broader/Specimen of | 20 |
| RO/has_specimen | has relationship other than synonymous, narrower, or broader/Has specimen | 20 |
| RO/has_finding_method | has relationship other than synonymous, narrower, or broader/Has finding method | 17 |
| RO/finding_method_of | has relationship other than synonymous, narrower, or broader/Finding method of | 17 |
| RO/has_focus | has relationship other than synonymous, narrower, or broader/Has focus | 13 |
| RO/focus_of | has relationship other than synonymous, narrower, or broader/Focus of | 13 |
| RO/substance_used_by | has relationship other than synonymous, narrower, or broader/Substance used by | 12 |
| RO/has_intent | has relationship other than synonymous, narrower, or broader/Has intent | 12 |
| RO/uses_substance | has relationship other than synonymous, narrower, or broader/Uses substance | 12 |
| RO/intent_of | has relationship other than synonymous, narrower, or broader/Intent of | 12 |
| RO/has_course | has relationship other than synonymous, narrower, or broader/Has course | 8 |
| RO/includes_sub_specimen | has relationship other than synonymous, narrower, or broader/Includes sub specimen | 8 |
| RO/specimen_source_identity_of | has relationship other than synonymous, narrower, or broader/Specimen source identity of | 8 |
| RO/sub_specimen_included_by | has relationship other than synonymous, narrower, or broader/Sub specimen included by | 8 |
| RO/course_of | has relationship other than synonymous, narrower, or broader/Course of | 8 |
| RO/has_specimen_source_identity | has relationship other than synonymous, narrower, or broader/Has specimen source identity | 8 |
| RO/specimen_source_morphology_of | has relationship other than synonymous, narrower, or broader/Specimen source morphology of | 6 |
| RO/has_specimen_source_morphology | has relationship other than synonymous, narrower, or broader/Has specimen source morphology | 6 |
| RO/has_modification | has relationship other than synonymous, narrower, or broader/Has modification | 3 |
| RO/is_modification_of | has relationship other than synonymous, narrower, or broader/Is modification of | 3 |
| RO/subject_relationship_context_of | has relationship other than synonymous, narrower, or broader/Subject relationship context of | 2 |
| RO/has_subject_relationship_context | has relationship other than synonymous, narrower, or broader/Has subject relationship context | 2 |
| RO/finding_informer_of | has relationship other than synonymous, narrower, or broader/Finding informer of | 1 |
| RO/has_finding_informer | has relationship other than synonymous, narrower, or broader/Has finding informer | 1 |
