I am flying from Dallas Texas. Is there a covid 19 test laboratory I must use?

I have contacted the embassy many times via email and phone and have not gotten through. The Institute I work for in China has sent 3 official letters asking for help with one question so I can make travel plans back to China.

In Dallas Texas can I go to any laboratory facility to get testing?

One instruction in your Q and A says I can go anywhere that is a licensed facility and another says it must be AYASS Bioscience or Real Time Laboratories, the third was it must be Devlabbio.

Due to the 48 hour turn around time to travel I need to be sure. Can you tell me what is the laboratory or is it any laboratory.