The “quick antibody COVID-19 tests” for qualitative IGG and IGM antibody (use from day 7 onwards with symptoms) measurement that we use are from Armin Laboratory in Germany. They are for clinic use and are based on a finger prick blood test; giving us information of the presence of active infection (IGM) and resolving infection and immunity ( IGG)
The Cov-2 RT-PCR antigen swab ( Use from day 2 onwards, measures viral load) for CV-19 is used for early diagnosis form day 2 of symptoms and is mainly only positive in the first 2 weeks of infection. It is a throat or nasal swab test.
A London lab PHE approved quick IGG ( use from day 14 of symptoms onwards; or use to check whether you have had the illness in the past) test is based on a finger prick of blood taken at home ( 10 drops of blood). This shows whether you may recovering from Covid-19 & whether you have some current immunity. The results are shown as positive, negative or borderline.
A quantitative test by Armin labs in Germany is available for IGG/IGM/IGA ( use any time if you think you may have the infection of have had it) measurement. This is of interest for more accurate immunity levels based on actual numerical levels of immunity.