Currently, most of the NHSNCoLab partners are piloting data transmission to NHSN’s FHIR endpoint (NHSNLink) via FHIR R4 API. However, NHSN also has selected use cases where testing involves other methods of data transmission and/or aspects of NHSN measure development and implementation (e.g., early exploration of data elements to support healthcare-associated VTE surveillance via NHSN).