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What are normal TSH levels?

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Normal TSH levels should be between 0.4 and 4.0 mU/L; a test result above this range indicates an underactive thyroid and a result below this range indicates an overactive thyroid.1

Find out more about tests used to diagnose hypothyroidism

Reference:

1. Shomon M. TSH levels: what do high and low levels mean? Verywell Health. Accessed May 23, 2023. https://www.verywellhealth.com/understanding-thyroid-blood-tests-low-or-high-tsh-3233198