Thyroid Stimulating Hormone (TSH)
- Sample Type
- Standard
- Fasting
- No
- Unit
- mIU/L
TSH, produced by the anterior pituitary, is the most sensitive marker for screening thyroid dysfunction. It operates via a negative feedback loop: when thyroid hormones (T3/T4) are low, TSH rises to stimulate the gland; when they are high, TSH drops. It is essential for diagnosing Hypothyroidism and Hyperthyroidism, and for titrating levothyroxine therapy.
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Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
Biotin (Vitamin B7) supplements can cause analytically false low TSH results. Furthermore, 'Euthyroid Sick Syndrome' during acute systemic illness can cause abnormal TSH levels in patients with a healthy thyroid. Pregnancy-related HCG can also suppress TSH levels in the first trimester.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Thyroid Stimulating Hormone (TSH):
Official Sources
- TSH test: MedlinePlus Medical EncyclopediaMedlinePlus
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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