Parameters for testing... that's a good question. Of course, we hear of lots of 'asymptomatic' people getting tested. My parameters would be someone high risk - meaning known exposure or recently traveled to an area with a high current infection rate (like Italy or Spain) and has symptoms - cough and fever. the parameters are variable based on how many tests you have available, and how many people need testing. Last I knew, in our office we had 3 tests left. After testing about 5 or 6. Still no results on any of those. Sounds like a week or so from the lab we are using - they get sent to Dallas, and from there apparently to Vermont. Freaking ridiculous.
All of this seems to change almost every day. Go figure.
the CEO of our local hospital said their current parameter includes doing a standard flu test and a standard strep test once the person is interviewed about symptoms. So basically they are working hard to make the Covid test the last one they have to do.