Depends: On who you ask. Most lab reports show normal as being 0.5 - 5 mlu/l, but many people feel the range should be 0.3 - 3. If you are being treated for hypothyroidism, the ideal range is 1 -2. I usually start to take notice when someone's TSH is >2.5. See http://www.Nlm.Nih.Gov/medlineplus/ency/article/003684.Htm.
Answered 2/15/2019
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