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Thyroid

TSH unit converter

Thyroid-stimulating hormone (thyroid screening)

Also known as: Thyrotropin, Thyrotrophin, Thyroid-stimulating hormone, Basal TSH, Thyreotropin, Thyrotropine

Converter

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Reference range

UnitAdults
mIU/L = µIU/mL0.4 – 4.8

Source: MedlinePlus (NLM): TSH test · Last reviewed: 2026-10-14

Note from the source: 0.4-4.8 µU/mL (= mIU/L); experts do not agree on the upper limit, older adults may have higher values (MedlinePlus)

Frequently asked questions

What is the reference range of TSH?

For adults the range is 0.4 – 4.8 mIU/L (MedlinePlus (NLM): TSH test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for TSH?

Common units are mIU/L.

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