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Hormones
TSH
Clinical biomarkerThyroidBloodmIU/L
The primary pituitary signal used to assess thyroid function.
What it measures
Thyroid-stimulating hormone concentration.
Why it matters
Core clinical test for thyroid dysfunction.
How to interpret it
Interpret with free thyroid hormones, symptoms, age, medications and clinical context where indicated.
Important limitations
Population reference ranges and individual set points differ; not an aging-rate biomarker.
Evidence status
Clinical biomarker
Established clinical endocrine biomarker.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
For education and evidence exploration, not diagnosis or individualized medical advice.