My wife has been tested at least three times and it always comes back negative. She has the disease and had the Deer Tick bite, Rash and symptoms following.
The test can only confirm you have the disease. It simply is not accurate enough to prove you do not have it. A clinical diagnosis is needed to confirm the disease. For that you need a Lyme Literate Medical Doctor aka LLMD.
I know more about Lyme Disease than any single other disease, as I have been the one to treat my wife. She is doing well now.
Dan