TSH Level 1.516 mIU/L: Is This Normal?

A TSH (thyroid-stimulating hormone) level of 1.516 mIU/L falls within the typical reference range of 0.4 – 4.0 mIU/L used by most laboratories. This suggests normal thyroid function.

Context Matters

• Reference ranges vary slightly by lab and assay methodology.
• Clinical symptoms, free T4, free T3, and thyroid antibodies should also be considered.
• Pregnancy, medications (e.g., biotin, steroids), and acute illness can affect TSH.
• Optimal range for fertility or specific conditions may be narrower (e.g., <2.5 mIU/L in early pregnancy).

When to Discuss with Your Provider

• If you have symptoms of hypo- or hyperthyroidism despite a "normal" TSH.
• If you're pregnant or planning pregnancy.
• If you're on thyroid medication—target may differ.
• If you have a family history of thyroid disease.

Always discuss results with your healthcare provider for personalized interpretation.