Not all elements are required, but there are certain fields that must be completed or the submission will not be accepted. Whether your site is a Standard or Vanguard participant determines which elements are required. There are also conditional fields that are not necessary to be completed for all uploads. Any field that is not required must be populated with either “Not Reported” or “NR.” A complete listing of non-required and required fields are designated in the Data Specifications and Data Dictionary documents.