Community Health Clinic in the Paragon Bldg behind the hospital is where to go. I returned to Canada a few weeks ago.
Unless things have changed lately, you do not make an appointment. Show up, fill out a form, pay your bill, then you line up outside, the technician comes out to do it and you get an email with results a short time later.
https://www.facebook.com/communitymedicallaboratoryvi/