Hormon mU/l (mIU/l)
TSH
Thyroid-stimulating hormone produced by the pituitary gland
Also known as
thyrotropin TSH basal thyroid-stimulating hormone
Definition
TSH (thyroid-stimulating hormone, also called thyrotropin) is produced in the pituitary gland and regulates thyroid hormone production via a feedback loop. It is the most sensitive and widely used screening marker for thyroid dysfunction. An elevated TSH indicates hypothyroidism; a suppressed TSH suggests hyperthyroidism or overtreatment.
| Parameter | Value |
|---|---|
| Unit | mU/l (mIU/l) |
| Reference Range | 0.4–4.0 mU/l (per clinical guidelines) |
| Optimal Range (lab2go) | 0.5–2.5 mU/l (lab2go Optimum Zone for well-being) |
Last Reviewed: 17 April 2026 · maritta