Hi Ezequiel,

I am a native speaker of European Spanish and thus cannot comment on the Latin American locale, but as a native Spanish speaker and translator I would recommend translating this sentence as "Hazte la prueba del COVID-19" for an informal tone and "Hágase la prueba del COVID-19" for a more formal tone, depending on whether you decide to use "tú" or "usted" throughout the app.
Some food for thought: the Real Academia de la Lengua Española recently acknowledged the possibility of referring to COVID-19 in its feminine form in Spanish ("la COVID-19"), since the final "D" in the acronym stands for "Disease" (i.e. "la enfermedad"). However, it is mostly referred to in the media in its masculine form, as "el COVID-19", because it is associated with the virus (i.e. "el virus"), so I would choose the masculine form. You can read the full article here: https://www.rae.es/noticias/crisis-del-covid-19-sobre-la-esc...

I hope this helps!
Thank you and best of luck with your translation,

Kind regards,
Lucía

Does that fragment appear in a title/subtitle? In that case, I would add some words, something like:

Haz el test para detectar la COVID-19