Where can I find the list of child elements for a panel term in LOINC?
A panel term in LOINC is one that contains an enumerated set of child elements. In the laboratory world, this may be called a panel, profile, or battery. The same structure in LOINC is used for other kinds of enumerated collections, like survey instruments, forms, and other data sets. We use the word "panel" in a generic manner to cover all of these kinds of enumerated collections.
There are several ways to find the definition of a panel term in LOINC, including the listing of all the child elements that panel contains.
In RELMA, the details pages for panel terms show the set of child elements. You can get to the details page from the context menu (right click) for any term in the row. Look for the "View Details" options. Both the Simple and Comprehensive pages show the child elements. The Comprehensive page shows additional detail about each child element. Here's a screenshot of the Electrolytes panel in Blood:
You can also get the listing of the child elements for a panel in a grid format by choosing "View Panel Children" from the context menu. Here's what that display looks like:
Using the online LOINC search application (search.loinc.org)
In the LOINC search app, you can view the details of a panel term (or any other LOINC term) in the search results by clicking the hyperlink on the LOINC number or from the context menu (look for the "View Details" options). Just like in RELMA, the details pages for panel terms show the set of child elements.
From the LOINC Panels and Forms File
One of the Accessory Files published in each release is the LOINC Panels and Forms File. (Available from the main downloads section of this site). The FORMS tab of this spreadsheet contains the hierarchical information about the panels in LOINC via a parent-child relationship. A sample of this structure for the Electrolytes panel in Blood is shown below: