US Core Implementation Guide, published by HL7 International - Cross-Group Projects. This is not an authorized publication; it is the continuous build for version 6.0.0-preview). This version is based on the current content of https://github.com/HL7/US-Core/ and changes regularly. See the Directory of published versions
The following examples are published with this guide, and all are available as a downloadable zip file here. Another source of examples that conform to this guide is the synthetic patient data generated by Synthea TM in the FHIR R4 format.
These example instances show what data produced and consumed by systems conforming with this implementation guide might look like. Every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification nor are they fully representative of real world examples.