Enter your TSH result to see how it sits against the standard reference bands used by most laboratories.
TSH
— mIU/L
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- Risk spectrum with your position marked
- Reference ranges from the original publication
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Scientific references
What TSH measures
The pituitary releases TSH to push the thyroid. High TSH means the gland is underperforming, low TSH usually means it is overactive, because the feedback loop moves in opposite directions.
Reading the bands
- Below 0.4 suggests an overactive thyroid and needs free T4 and T3
- 0.4 to 4.2 is the usual normal window
- 4.2 to 10 with normal T4 is subclinical hypothyroidism
- 10 or more usually indicates overt hypothyroidism
Why context matters
Pregnancy, age over 70, acute illness and biotin supplements all shift TSH. Results are always read alongside symptoms and free hormone levels.
Next step
Borderline results are typically repeated in two to three months before any treatment decision.