Can I take this at home covid test on Shabbat?
It is similar to a pregnancy or ovulation test in which a colored line appears on the paper indicating either a positive or negative covid detection.
There are multiple companies offering an at home test, this one is QuickVue
I believe it would depend what the need would be. If it’s needed for a health reason, a goy can do it, unless of course it’s a possible sakana nefashos. This is a very complicated subject, so it’s best asked when it’s really relevant