Many have with content in other areas of terminology. These are one of the ways in which provides computer readable definitions for medical . For example, diseases in generally have a to the body site affected by the disorder and a to the morphology associated with the disease. Procedures in might have to the , which defines the type of surgical action being carried and the procedure site, for example. Examples of for a disease and a procedure are shown below. A full list of the that can be used for each type of can be found in .
Figure 44. Relationship for disease appendicitis
Figure 45. Relationships for procedure craniotomy
These are very useful in the context of data retrieval and analysis. The can also be used to aid in the search for specific in cases where the term
alone may not sufficiently distinguish between choices. For example, a search for all inflammatory diseases of the lung could be carried out as follows:
- Use the to compile a list of all that are lung structures;
- Search for any that has a row in the Relationship file with a of "Disorder site," and with ConceptId2 included in the list of lung structures;
- Now exclude any procedures from the list that do have the
"Inflammation" in the table;
- Final product
list of all lung disorders that involve inflammation.
To achieve these same results with a string search we would have to perform separate searches for
and many other conditions that cannot be linked via a sample string search.