Dec 22, 2023 · This article describes the TSH test and its results. We also discuss what high and low TSH levels indicate and available treatments.

Mar 21, 2025 · Normal thyroid-stimulating hormone (TSH) levels generally fall between 0.5 and 5.0 milliunits per liter (mU/L). If your TSH level is higher than 5.0 mU/L it suggests an underactive thyroid, or hypothyroidism, since TSH regulates hormone production.

Thyroid-stimulating hormone (TSH) triggers your thyroid to release its hormones. High TSH levels usually indicate hypothyroidism and low levels, hyperthyroidism.

May 7, 2018 · Find out all you need to know about TSH levels (including normal, high or low thyroid stimulating hormone levels). Read what doctors say about optimal TSH levels and how they affect thyroid hormones T4 and T3. Including useful chart of TSH, FT4, FT3 levels.

Feb 11, 2025 · A high TSH level indicates low thyroid hormones in the body, while low TSH indicates elevated thyroid levels. High TSH symptoms are associated with a slowed metabolism and may include cold intolerance, slower heart rate, constipation, thinning hair , and depression .

Nov 14, 2023 · A TSH test is done to find out if your thyroid gland is working the way it should. It can tell you if your thyroid gland is overactive (hyperthyroidism) or underactive (hypothyroidism).

Aug 17, 2024 · Your TSH level is generally considered high when it is above 4.0 mUI/mL. TSH levels rise when your thyroid gland is not producing enough thyroid hormone.

Mar 24, 2022 · Doctors measure TSH levels in ranges. In general, the normal reference range for TSH levels is 0.35 to 4.5 mIU/l of blood. A TSH reading in this range indicates that the thyroid gland is functioning normally. However, some people may fall outside the normal reference range and still have thyroid glands that are functioning as they should be.

What do the results mean? Your TSH test results can tell you if your thyroid is making too much or too little hormones. But the test can't explain why your TSH levels may be too high or too low.

Learn what TSH levels mean, how they impact thyroid health, and what normal, high, or low TSH levels indicate. Get insights on symptoms, diagnosis, and treatment options.