I need a referral letter to go get tested, was tested 12 days ago positive ?

Not needed: If you have already tested positive for Covid, you do not need to retest. You should have self isolated for the last 12 days. The CDC recommends 3 parameters for leaving self isolation and returning to work. 1)No fever for 24 hours without using fever reducers. 2) self isolation for a minimum of 10 days and 3) Symptoms are gone or all improving. You may need to have a Dr Exam to receive clearance