When I pay for tests on Grassroots Labs, do I pay at the testing site as well? Seth Aten March 10, 2025 14:53 If you order and pay for your lab tests on the GRL website, you will not have to pay anything at the testing center. Related articles Do I use my doctor's order to purchase labs on Grassroots Labs? Can I make changes to my order after making the purchase? Do I have to make an appointment at the testing center? When I purchase the tests, how long is the Requisition good for? How will my provider get the Results?