I had my blood drawn at Labcorp yesterday. I went in with a doctors prescription and insurance and had to pay them $50. They showed me though that they were going to bill my insurance $650!!!! I almost fell over. I'm sure the price is inflated for the insurance company so you may want to check first. There is also a place around here called Any Lab Test Now and they have a .com site (franchise) and they will do lab tests without a doctor's note. I think they ran about $350.
If you are looking for a lab because you are self-administering the HRT you should probably want to know that it is a heck of a lot cheaper to just get a doctor's prescription for what you need. I can get my HRT for about $30/month as all the drugs are on the "discount lists".
I started off doing it myself but when I decided it was going to be a life long thing I decided to suck up my pride and just go see a doctor to get a scrip, tests, and advice. In the end no body really cared, not the HRT doc, my GP (who I came out to at my physical), or the pharmacist that fills my scripts.