Q.   I saw that there is a clinic in my neighborhood that does Covid testing on Saturday. If it is in walking distance and I don’t have to do any melachos, can I go for a nasal swab?
A.  Horav Shlomo Miller’s Shlit’a opinion is that if needed it could be done. The Rov
recommended to check if the swab is placed on a solution that changes its color if a Covid infection is present. That change of color may be prohibited when the tester is doing it for you.
However, the Rov added that writing or recording results etc., is basically done for the technicians advantage, and in need will not affect.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a