The present guideline has the objective of identifying the most appropriate diagnostic test and/or diagnostic/screening approach for1) patients with signs and symptoms of COVID-19; 2) travelers from areas with low and high COVID-19 prevalence, healthcare workers, and other individuals at risk for exposure to SARS-CoV-2; 3) asymptomatic individuals (including general population) and 4) those with close contact with a person infected with SARS-CoV-2; and 5) symptomatic individuals following re-infection and/or vaccination. However, evidence for re-infection and post-vaccination testing approach was scarce when the literature search for the index guidelines was performed. Hence, associated PICOs could not be addressed. Additional considerations include the type of biomaterial, time since onset of symptoms/contact with infectious case, age, disease severity, and risk of developing severe disease. The document is intended to provide guidance to clinicians, clinical microbiologists, other health care personnel, and decision makers.