LabwiseTSHmIU/L
TSH is a signal from the pituitary gland that tells the thyroid how much hormone to produce. It is the most common first test used to look at thyroid function.
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What TSH measures
TSH is a signal from the pituitary gland that tells the thyroid how much hormone to produce. It is the most common first test used to look at thyroid function.
If your TSH is low
TSH below the reference range often means the pituitary is asking for less thyroid hormone, which can happen when thyroid hormone levels are on the higher side.
Commonly associated with
- An overactive thyroid
- Thyroid hormone medication
- Early pregnancy
- Certain medications
If your TSH is high
TSH above the reference range often means the pituitary is asking the thyroid for more hormone. It is usually looked at together with free T4.
Commonly associated with
- An underactive thyroid
- Recovery from illness
- Certain medications
- Normal day-to-day variation
Typical reference range
| Group | Typical range |
|---|---|
| Adults | 0.4 – 4.5 mIU/L |
Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.
If it is within range
Your TSH is within the reference range printed by your lab.
Also listed as
Thyroid Stimulating Hormone, TSH, 3rd Generation, TSH w/ Reflex to FT4, Thyrotropin
Related tests
This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.