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endocrinologyHas Critical Values
Thyroid Stimulating Hormone
TSH· also: Thyroid Stimulating Hormone
Clinical Overview
TSH is secreted by the pituitary gland to control thyroid hormone production. It is the single most sensitive test for thyroid dysfunction. High TSH = hypothyroidism; low TSH = hyperthyroidism.
Reference RangesWHO/IFCC standards
| Age Group | Sex | Reference Range | Unit | Notes |
|---|---|---|---|---|
| Adults (18–64) | All | 0.4 – 4 | mIU/L | — |
| Elderly (65+) | All | 0.5 – 6 | mIU/L | Higher range acceptable in elderly |
| All ages | Female | 0.1 – 2.5 | mIU/L | Pregnancy first trimester |
Also reported in: µIU/mL.
Critical (Panic) Values
Critical Low: < 0.01 mIU/L. Critical High: > 100 mIU/L. Values outside these limits require immediate clinical attention.
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Related Topics
thyroidhypothyroidismhyperthyroidismTFT