Re: Explain T3, T4, FT3, FT4
Hi and welcome: you asked the million dollar question and not so easy to answer. The best I can recommend is to do some research by books and net as it is fairly involved. In a nutshell, the free Ts (FT4, FT3) are hormones that your body uses to function properly. If these are off, for some people, by just a bit, that person gets hyper symptoms or hypo symtpoms. For propper testing of thyroid function a good doctor tests FT3, FT4, TSH and also goes by symptoms of the patient. Here is a good book that I would recommend: Living Well with Hypothyroidism by Mary Shomon. There is a lot of general info. about the thyroid as well.