Which thyroid level: There are various types of thyroid blood tests. I don't know of any particular one where it is supposed to be 4 or 5. If your TSH level was 1.8, that is normal, and does not need treatment. However if the 1.8 refers to a "total T4" level, then that would be low (normal range 4.5-12).
Answered 6/19/2015
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