I have just been to see a private doctor who has recommended that I be tested for Free T3, Reverse T3 and Thyroid Antibodies which my GP has not done since I was first diagnosed with hypothyroidism 3 years ago. The lab recommended by the private doctor charges £234! I am also planning to approach the GP to get the tests done on the NHS but I am not sure of my rights in this regard. Is it possible for the GP to refuse even though he has been treating me for the same condition for the past 3 years? Grateful for any useful information you can provide.