  sh-why-its-useless/ i have no idea which tests they performed, but they usually check tsh, which is not giving as much information as they claim. there can be problems converting t4 to t3 for instance which won't come up unless the proper tests are done, which doctors are very very reluctant to do in north america anyways. so free or unbound t3 is what your body needs to be making, and if it can't then your thyroid does not function well.  parts of the uk including the midlands fluoridate their water
Canada