Rapid fingertip test VS PCR, Swab test
PCR (Swab) test – throat/nose swab tests for presence of the actual virus. Usually accurate when you first start developing symptoms but this is dependent on taking the swab correctly.
Rapid (Serology) test – blood test which looking at immune response specifically to the virus. Looks for both short term (IgM) and long-term (IgG) antibodies. May not show up as positive in the first few days of having the illness so if tested too early you may get a false result.
Please see the picture to compare tests