1. A computer storage medium having embodied thereon computer-readable instructions, that when executed, enable a computing device to perform a method of identifying a test component that is usable to perform an orderable healthcare procedure, the method comprising: receiving the orderable healthcare procedure, wherein the orderable healthcare procedure is input by a user and wherein the orderable healthcare procedure identifies a diagnostic screening that is usable to detect an existence of a particular molecular entity in a sample; retrieving a navigational concept, wherein the navigational concept represents both a parent tier in an ontology hierarchy and a human-biology concept; displaying on a device the navigational concept to be selected by the user; responsive to selection by the user of the navigational concept, associating the orderable healthcare procedure with a uniquely identified molecular entity that relates to the particular molecular entity and that is a child concept of the navigational concept; traversing biological relationships of the uniquely identified molecular entity to identify a test component that is usable to detect the existence of the particular molecular entity in the sample; displaying to a user the test component to be selected; and upon receiving a selection of the test component, displaying the test component as a component of an assay that is usable to detect the existence of the particular molecular entity in the sample.