Once throid disease (which is heriditary) begins, you do have to continue blood tests. That is how the doctor knew about the Graves Disease, also when I went in remission (which is quite unusual). The meds for Graves disease (hyperthroid) should not taken for more than 2 years or if it continues, need to have part of the throid destroyed/removed.

Only thru continual blood test did it show I had become Hyporthroid. The meds (Synthroid) can be taken for life and usually are. The doseage is dependent on the continued blood work. I did find our (thru the internet) that the generic for Synthroid is not recommended and does not work the same way.

Originally, I was using the generic and blood test showed, I needed a higher dose. I asked my doctor to have me do "brand only" Synthroid instead of raising the prescription. 4 months later, the blood test showed normal. Once the disease is set of for various reasons, you should alway be tested for changes. It does not go away.