Thyroid stimulating hormone (TSH)
What it measures
TSH is made by your pituitary gland and tells your thyroid how much hormone to produce. It's usually the first test used to screen thyroid function.
Often reported in mIU/L. Reference ranges differ between laboratories, ages and sexes, so always compare with the range printed on your own report.
Why it matters
TSH and thyroid hormone levels (like free T4) move in opposite directions, so TSH alone is a starting point rather than a full picture.
Questions worth asking
- Should free T4 or free T3 also be checked?
- Could timing, medications, or recent illness affect this result?
- Is a repeat test recommended before further evaluation?
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Educational information only. Not a diagnosis, not treatment advice, and not a substitute for a licensed healthcare professional.