It's OK, with the correct capitalisation as shown above. I assume you're talking about a PCR test, which has to be administered by a medical professional (or volunteer). I would probably say "The doctor tested him for Covid".The doctor carried out a Covid/COVID test on him.
Is the sentence correct?
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: