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TSH Interpreter (Thyroid Function)

Input

mIU/L
ng/dL
pg/mL

Thyroid Status

—

About

The TSH Interpreter evaluates thyroid function based on TSH (thyroid-stimulating hormone) and optional Free T4 and Free T3 levels. TSH is the most sensitive initial test for thyroid dysfunction. The pattern of TSH and free hormone levels helps distinguish between overt and subclinical thyroid disease, and guides further workup and treatment decisions.

Formula

No calculation — interpretation based on TSH and Free T4/T3 pattern
Normal TSH: 0.4–4.0 mIU/L
Normal Free T4: 0.8–1.8 ng/dL
Normal Free T3: 2.3–4.2 pg/mL

Interpretation

TSHFree T4Diagnosis
LowHighHyperthyroidism
HighLowHypothyroidism
LowNormalSubclinical hyperthyroidism
HighNormalSubclinical hypothyroidism
Normal—Euthyroid

References

  1. Garber JR, et al. Clinical practice guidelines for hypothyroidism in adults. Thyroid. 2012;22(12):1200-1235.
  2. Ross DS, et al. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism. Thyroid. 2016;26(10):1343-1421.

FAQ

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Disclaimer

For educational and informational purposes only. Not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.