Thyroid
TSH
Also known as: Thyroid Stimulating Hormone
What it means
A hormone from your brain that tells the thyroid how hard to work. High TSH = thyroid is sluggish (hypothyroid). Low TSH = overactive (hyperthyroid).
Typical normal range
0.45–4.5 µIU/mL
Reference ranges vary by lab, age, sex, and pregnancy. Always check the range on your own report.
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This is a plain-language explanation for patients, not clinical advice. AI can be wrong. Always confirm with your doctor.