Quantitative Test for COVID-19

Since April 2020 Hospital del Día Shell has offered a "Fast COVID Test". We measure two antibodies in blood: IgM and IgG. IgM is not very specific and is also positive with a common cold. IgG is specific for COVID. However, what happens  when both are positive? Is the patient still a danger for others? 

Therefore Hospital Shell now offers the new Quantitative Tests. This test gives us specific information about a patient who 1) already went through the disease, 2) is still in an acute infection, or 3) never was infected with COVID.