After the virus infection, the antibody IgM appears, and rises in the, early stage, while antibody IgG appears and rises in, the late stage.

By combining IgG and IgM, we can know if the body, is infected and at which stage .,
the Kit inckude:

Novel Coronavirus (2019-nCoV) IgG/IgM Test Kit
(Colloidal Gold)
Transport or store at room temperature from 2 to 30 C
If individual pouch unopened, the kit can be stored for 12 months.
Once the individual pouch is opened, this test card should be used within 1 hour.