TSH results may seem counterintuitive. A high TSH level suggests an underactive thyroid gland, while a low TSH levels indicate an overactive thyroid. TSH influences the production of thyroid ...

High TSH levels could be a sign of hypothyroidism while low TSH levels may signal hyperthyroidism. Thyroid disorders, which affect about 20 million Americans, can be diagnosed with a TSH test ...

Use a thyroid hormone suppression test to verify a discordant high TSH level. Normal response to 1mg of L-T4 or 200µg L-T3 administered p.o. is a suppression in serum TSH of more than 90% by 48 ...