i think you mean tsh. thyroid stimulating hormone. basically your pituitary gland is telling your body when more thyroid is needed or not. if this hormone level is low your body is making or getting sufficient thyroid; if it is high this means that your body needs more thyroid hormones.
does a high ths level mean your thyroid is too fast or too slow? . i have graves disease and had my thyroid ablated (i believe that is the correct term) with radioactive liquid. i take sythroid 0. 15mg currently but have had trouble keeping good levels.