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 ...

This article describes the TSH test and its results. We also discuss what high and low TSH levels indicate and available treatments. The normal range depends on a person’s age and whether they ...

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 ...

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 ...