TSH normal range — check your value

Roughly 0.4 to 4.0 mIU/L for non-pregnant adults. Pregnancy uses tighter, trimester-specific ranges.

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Your TSH test value

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TSH

mIU/L

What TSH measures

The hormone the pituitary sends to drive the thyroid. The first-line screening test for thyroid function.

TSH normal range chart

ResultTSH (mIU/L)

Below rangeBelow 0.4

In range0.4 – 4

Borderline4 – 10

Out of range10 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

TSH normal range by age and gender

AgeMaleFemale

0–1 years0.7 – 8.5 mIU/L0.7 – 8.5 mIU/L

2–6 years0.7 – 6 mIU/L0.7 – 6 mIU/L

7–11 years0.6 – 5.5 mIU/L0.6 – 5.5 mIU/L

12–17 years0.5 – 4.5 mIU/L0.5 – 4.5 mIU/L

18–30 years0.27 – 4.2 mIU/L0.27 – 4.2 mIU/L

31–45 years0.27 – 4.2 mIU/L0.27 – 4.2 mIU/L

46–60 years0.27 – 4.2 mIU/L0.27 – 4.2 mIU/L

60 years and above0.4 – 4.5 mIU/L0.4 – 4.2 mIU/L

What a high TSH means, and common causes

A high TSH usually means an underactive thyroid. The brain raises TSH when it senses too little thyroid hormone, so the number moves opposite to what people expect.

Common causes: Hypothyroidism, most often from Hashimoto's autoimmune thyroiditis, iodine deficiency, thyroid surgery or radioiodine, some medicines including lithium and amiodarone, and recovery from a recent illness.

What a low TSH means, and common causes

A low TSH usually means an overactive thyroid, because the brain stops signalling when hormone levels are already high.

Common causes: Graves' disease, a toxic thyroid nodule, thyroiditis, too high a dose of thyroid medication, and early pregnancy, which naturally lowers TSH.

Frequently asked questions

Roughly 0.4 to 4.0 mIU/L for non-pregnant adults. Pregnancy uses tighter, trimester-specific ranges.

It is mildly raised. When Free T4 is still normal this is called subclinical hypothyroidism, and many doctors simply repeat the test after six to eight weeks before deciding anything.

TSH is the brain's signal. Free T4 is what the gland actually produced. You need both to tell a genuine thyroid problem from a temporary signalling blip.

Iska matlab thyroid gland kam kaam kar rahi hai. Thakan, wazan badhna, thand lagna aur baal girna aam lakshan hain.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.