Thyroid Stimulating Hormone (TSH)
The pituitary gland hormone that controls thyroid function. The most sensitive test for thyroid disorders.
Typical normal range
0.4–4.0 mIU/L
If high ↑
Hypothyroidism (underactive thyroid): fatigue, weight gain, cold intolerance
If low ↓
Hyperthyroidism (overactive thyroid): anxiety, weight loss, heat intolerance
What is a normal Thyroid Stimulating Hormone level?
A typical reference range is 0.4–4.0 mIU/L. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Thyroid Stimulating Hormone level mean?
Hypothyroidism (underactive thyroid): fatigue, weight gain, cold intolerance. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Thyroid Stimulating Hormone level mean?
Hyperthyroidism (overactive thyroid): anxiety, weight loss, heat intolerance. Your doctor will interpret it alongside your symptoms and other tests.
About the Thyroid Panel
Thyroid tests show how well your thyroid gland is working. The thyroid helps control metabolism, so an over- or under-active thyroid can affect energy, weight, mood and heart rate.
See your own Thyroid Stimulating Hormone result explained
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Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.