If this happens, the test will probably be a PCR application:
dna pcr test for coronavirus testing:
oogle.com/search?q=dna+pcr+test+for+corona+coronavirus+testing%3A&rlz=1CAMWDF_enUS770US770&oq=dna+pcr+test+for+corona+coronavirus+testing%3A&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8
Nope. PCR is for the virus itself. Testing for antibodies is serogical. It will be ELISA. Like a home pregancy test.
Note that it has already been FDA approved for use on March 16th.