evidence: Currently, the standard test for COVID-19 is usually the RT-PCR test. In the RT-PCR, samples from the nose and throat are sent away for testing, usually to a large, central laboratory with specialist equipment. Other tests include imaging tests, like X-rays, which also require specialist equipment. [...] Routine laboratory tests cannot distinguish between COVID-19 and other diseases as the cause of infection, inflammation or tissue damage. None of the tests performed well enough to be a standalone diagnostic test for COVID-19 nor to prioritize patients for treatment. They will mainly be used to provide an overall picture about the health status of the patient. The final COVID-19 diagnosis has to be made based on other tests. None of these markers as stand‐alone tests are useful for accurately ruling in or ruling out COVID‐19. As a triage test would require a high sensitivity (< 80%), these tests have limited value as triage tests. Although there is low or very low certainty about the summary estimates in this review, we do not expect that studies with a low risk of bias will show a better performance than the tests included.