User Guide. This Laboratory Assessment Tool (LAT) is specifically designed to assess capacities of existing laboratories which have implemented or aim to implement SARS-CoV-2 testing. It addresses both core capacities of a laboratory and specificities related to SARS-CoV-2 testing. It is a focused and shorter version from the existing complete laboratory assessment tool that can be found at https://www.who.int/ihr/publications/laboratory_tool/en/ The target audience is any stakeholder performing laboratory assessments such as national health authorities, multilateral agencies, Non-Governmental Organizations (NGOs) and laboratory managers. Assessors can use the tool, and customized if needed, to meet local requirements or assessment context. This tool is an Excel file, which enables automatic calculations of module indicators. https://www.who.int/publications/i/item/laboratory-assessment-tool-for-laboratories-implementing-covid-19-virus-testing