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The Thyroid Stimulating Hormone (TSH) test is the single most sensitive and reliable initial screening test for thyroid disorde...
Also known as: TSH Test · Thyrotropin Test · TSH Level Test · Thyroid Screen Test · s-TSH Test
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The Thyroid Stimulating Hormone (TSH) test is the single most sensitive and reliable initial screening test for thyroid disorders. TSH — produced by the pituitary gland — acts as the master regulator of thyroid hormone production. When the thyroid is underactive, TSH rises to stimulate it; when the thyroid is overactive, TSH falls to suppress it. An abnormal TSH is often the first detectable sign of thyroid dysfunction — appearing before T3 or T4 become abnormal, and frequently before symptoms emerge. TSH is the recommended first-line thyroid test by all major endocrinology guidelines worldwide. No fasting required.
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What Does the Thyroid Stimulating Hormone (TSH) Test Measure?
| Level / Result | Possible Interpretation |
|---|---|
| 0.4–4.0 mIU/L (Normal) | Normal pituitary-thyroid feedback — euthyroid state |
| 4.0–10.0 mIU/L (Mildly elevated — subclinical hypothyroidism) | Thyroid beginning to underperform — FT4 usually normal; monitor or treat based on symptoms and anti-TPO status |
| > 10.0 mIU/L (Significantly elevated — likely overt hypothyroidism) | Thyroid significantly underactive — FT4 expected to be low; levothyroxine therapy indicated |
| 0.1–0.4 mIU/L (Mildly suppressed — subclinical hyperthyroidism) | Thyroid slightly overactive or physiological (first trimester) — confirm with FT4/FT3 and clinical assessment |
| < 0.1 mIU/L (Significantly suppressed) | Significant hyperthyroidism or TSH-suppressive levothyroxine therapy — FT4 and FT3 required to characterise |
| Undetectable (< 0.01 mIU/L) | Severe hyperthyroidism or intentional TSH suppression in thyroid cancer management — urgent evaluation if not expected |
Important Note: A single TSH result must always be interpreted in clinical context — medications (steroids, dopamine, amiodarone), acute illness (euthyroid sick syndrome), and pregnancy all affect TSH outside the standard reference range. The TSH reference range of 0.4–4.0 mIU/L is a population-derived range; individual patients often have a much narrower personal 'set point.' All results must be reviewed by a physician.
TSH as the Master Thyroid Marker — Why It Should Always Be Tested First: Every major endocrinology guideline (ATA, BTA, ETA) recommends starting thyroid assessment with TSH alone, and only ordering T3/T4 if TSH is abnormal. This is because TSH changes are amplified — a 50% fall in FT4 causes a 100-fold rise in TSH. TSH therefore detects thyroid problems in their earliest, most treatable stage, before T3/T4 deviates from the normal range. Skipping TSH and ordering T3/T4 alone misses the most important diagnostic lever in thyroid medicine.
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