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The PhenX team developed the COVID\u201019 Protocol Library to share data collection instruments, methods, and protocols in use by investigators and to reduce proliferation of similar protocols. The Office of Behavioral and Social Sciences Research and the National Human Genome Research Institute sponsored the effort, in collaboration with the NIH Disaster Research Response Program. As the COVID\u201019 library was being established, crowdsourcing was used to identify key topics related to the pandemic, which formed the basis of the COVID\u201019 Research Collection, and was released in the PhenX Toolkit. Long COVID continues to have an impact on human health. Long COVID is a chronic condition that occurs after SARS\u2010CoV\u20102 infection and is present for at least 3 months, encompassing a variety of symptoms or conditions that may improve, worsen, or be ongoing. Not surprisingly, submissions to the COVID\u201019 library began to address Long COVID symptoms. After discussions with its Steering Committee, the PhenX team established a collection of Long COVID measurement protocols. Also, there was significant interest in assessing the amount of overlap among all instruments submitted to the COVID\u201019 library. The intent was to develop a tool that could identify potential for cross\u2010study analyses. The COVID\u201019 Variable Compare Tool (VCT) integrates all COVID\u201019 Research Collection protocols and a prioritized subset of instruments from the COVID\u201019 library. The Long COVID Specialty Collection and the VCT support investigators\u2019 needs to combine and analyze data related to COVID\u201019 prospectively and retrospectively by identifying compatibility with other studies. \u00a9 2026 RTI International. 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