Sample Hierarchy for AIDS with Pneumonia

1. Sample Hierarchy for AIDS with Pneumonia AIDS About SNOMED Relationships AIDS with Pneumonia AIDS with bacterial pneumonia AIDS with viral Pneumonia AIDS with pneumococcal pneumonia

2. (233604007) Pneumonia (62479008) AIDS Relationships for AIDS with Pneumonia Is a Is a (111885006) AIDS with pneumonia Has finding site Has causative agent (39607008) Lung structure (19030005) Human immuno- deficiency virus Has finding site Associated morphology (116003000) Immune system structure (23583003) Inflammation

3. (62479008) AIDS (233604007) Pneumonia Relationships for AIDS with Pneumococcal Pneumonia Is a Is a (37721008) AIDS with pneumococcal pneumonia Has causative agent Has finding site (9861002) Streptococcus pneumoniae (39607008) Lung structure Has finding site Has causative agent Associated morphology (19030005) Human immuno- deficiency virus (116003000) Immune system structure (23583003) Inflammation

4. Hierarchy for Streptococcus Pneumoniae (Organism) Gram-positive coccus SubclassGram Positive Cocci Family streptococcaceae Catalase-negative Gram-positive coccus Streptococcus Streptococcus pneumoniae (Living organism)

5. Hierarchy for Human Immunodeficiency Virus (Organism) Retrovirus Subfamily lentivirinae Primate immunodeficiency virus Human immunodeficiency virus

6. Concept Inter-relationships for Disorders • SNOMED CT uses relationships between concepts to provide logical, computer readable definitions of medical concepts. These relationships, which can be hierarchical or non-hierarchical, enable health data to be re-used for decision support, outcomes analysis and clinical research. Follow this link to see the relationship types applicable to finding and disorders.

7. Relationship Types for Disorders Clinical Attributes • Finding Site • Causative Agent • Associated Morphology • Laterality Hierarchical • Is a

8. The “Is a” Relationship • The “Is a” relationship is used to create a hierarchical relationships between concepts, relating specific concepts to a more general category. For example: “Streptococcus pneumoniae”“Is a” (kind of) “Streptococcus”

9. The “Finding site” Relationship • The “Finding site” relationship identifies the part of the body affected by the specific disorder or finding. For example: “Pneumonia” (has) “Finding site” “Lung structure”

10. The “Causative agent” Relationship • The “Causative agent” relationship identifies the direct cause of the disorder or finding. The causative agent is the bacterium, virus, toxin or environmental agent that causes the disorder. For example: “AIDS” (has) “Causative agent” “HIV virus”

11. The “Associated morphology” Relationship • The “Associated morphology” relationship identifies the abnormal physical condition that is characteristic of a given disorder or finding. For example: “Pneumonia” (has) “Associated morphology” “Inflammation”

12. The “Laterality” Relationship • The laterality relationship specifies the side of the body that applies to an anatomy concept.  Procedures, findings and disorders can have laterality by qualifying their site (procedure-site or finding-site). For example: “Left kidney” (has) “Laterality” “Left” “Cyst of left kidney” (has) “Finding site” “Left Kidney” “Biopsy of left kidney” (has) “Procedure site” “Left Kidney”