I have been to quest in the past and know that having an appointment is key. Not having an appointment means you will most likely have a long wait time. I scheduled my appointment online and literally was in and out after 15 minutes. Inside was filled with people and finding a seat at first wasn't easy, but there wasn't a line to check in and the girl who helped me was courteous so that was nice. Since seating was limited, I was glad to be called back so quickly and done so fast. There is a private parking lot and you might have to circle around a few times for a spot since this place gets busy. Unless you need some sort of test done ASAP you should really consider making an appointment even if nothing is open for a few days to avoid long wait times as a walk-in.