Thanks QL team for this list of clinics - it would have been useful to have the phone number for each centre too or the website link to their online covid testing booking page -

Just to add to this: Sidra Medicine have started from today doing covid tests with a 3hr hour result at cost of 660 QAR

I did my test and paid 160 QAR - result came back in under 7.5 hrs - altogether a good experience