To open your newly created CCC and SNOMED CT subset, Launch MetamorphoSys and click on Browse my subset.
Select File and then Open Subset or click on the Open Subset icon in the top left of the page.
Click on Browse.. to select your destination folder.
Your previously created subset was saved in the META folder within your destination folder. Make sure that this folder is selected, then click Open..
Click OK to open your subset.
When you open your CCC and SNOMED CT subset, you will see the Rich Release Format (RRF) Browser. The RRF Browser allows you to find a term and its synonymy within your subset by using one of three search tab options: Tree Browser, UI Search, and Word Search.
- The Tree Browser tab provides a hierarchical view of the vocabularies included in the subset. Click on the plus or minus signs to expand or collapse portions of the tree view.
- The UI Search tab allows you to search for a term if you know the Unique Identifier (UI), including the CUI or Concept Unique Identifier.
- The Word Search tab allows you to enter a word or phrase into the search bar to find it in the subset.
Click on the Help button located at the top right of the RRF Browser window (Figure 21) for additional information on the three search tabs and navigating the RRF Browser.
In this example, you will use the Word Search tab to search for the CCC term, “Hypothermia.” In the Word Search bar under Enter search terms for CUI: (ENG), type “hypothermia,” and click Search.
The results show all of the related Concept Unique Identifiers (CUI) for the term Hypothermia in the UMLS. A permanent and unique CUI is assigned to each concept in the UMLS. Double click the concept C0020672 Hypothermia.
The results default to Report View. The Report View window of the RRF browser shows the UMLS Metathesaurus data in an organized, easy to read format.
The Report View lists the following information:
- Concept Identifier - a unique and permanent identifier (CUI) assigned to a concept in the UMLS.
- Semantic Type - the high level category assigned to each concept in the Metathesaurus.
- Definition (if available) - Definitions are provided by the terminology.
- Atoms - the building blocks of the UMLS; the concept name(s) from each terminology.
In Figure 24, the Concept “Hypothermia” has the CUI C0020672, the Semantic Type is Finding, and the Definition comes from CCC: “Abnormal low body temperature.” There are also 21 Atoms listed for this concept. The Report View is explained in further detail in the UMLS Reference Manual.
You can also view the results in Raw View by clicking on the Raw View tab. The Raw View window of the RRF browser displays the data as it is contained in the Metathesaurus data file.
For additional information on Report View and Raw View, click on Help.
In the Report View Window, the Atoms section is where you can find synonymous terms in CCC and SNOMED CT (Figure 26). Atoms are the basic building blocks of the Metathesaurus and are the concept names or strings from each of the source vocabularies. It is important to note that not all UMLS concepts will have atoms from both your nursing terminology and SNOMED CT because the source vocabularies have a specialized scope. This is one of the benefits of the UMLS: it provides a unified view of many biomedical terminologies, thus providing synonymy.
In this example, the UMLS concept hypothermia contains 21 Atoms for both CCC and SNOMED CT. The first atom is from the CCC and the remaining atoms are from SNOMED CT (Figure 27). Each atom contains the concept name or strings from the particular terminology. It also lists the Code and UMLS String Concept Unique Identifier (SCUI).
You will notice that there are two symbols to the left of some of the SNOMED CT atoms. These represent atoms that are obsolete or suppressed in the UMLS. In other words, they are atoms that are no longer active in the UMLS. To hide these atoms click on Options and then Report View Options.
The Report View Options window will appear. Check the boxes to hide obsolete and suppressed atoms, then click OK.
The resulting Report View will only contain the atoms that are currently active in the UMLS.
If your subset contains multiple source vocabularies it may be helpful to use the Highlight by feature to identify the atoms from each source. To apply a highlight, click on the drop-down menu next to Highlight by and select Source List.
A window will appear that prompts you to select the source(s) you would like highlighted in your report. Here, select Clinical Care Classification (CCC) and US Edition of SNOMED CT and click OK.
The Report view will now display a different color highlight on the atoms from CCC and SNOMED CT. A Color and Style Legend is also provided. This will make it easier to identify the synonymous terms that are active in the UMLS for both CCC and SNOMED CT.
In this example, it was determined that the concept Hypothermia has one term in CCC: Hypothermia. It also has six synonymous terms in SNOMED CT: Body temperature below normal, Decreased body temperature, Hypothermia, Hypothermia (finding), State of hypothermia, and Temperature subnormal.