Labcorp, but they don't seem to allow self orders. I think it's Sonora Quest and Labcorp in my neck of the desert. I kinda don't think they have any competition. There was a law passed when that crazy woman did the Theranos thing that allows us to order our own lab work out here, but the labs don't seem to keen on it. Before they broke their website, I was able to order and pay and when I went in, it looked to them like a doc ordered it, so there weren't any questions. Now, it's an argument every time and they shut down a bunch of their offices, so the one I go to is weeks out for a blood draw appointment, when it used to be same day or at worst two days out.