Is a TSH Level of 100 High?

By Staff WriterLast Updated Mar 26, 2020 7:51:56 PM ET

A TSH, or thyroid-stimulating hormone, level of 100 is very high, and it rests well above the normal range of 0.4 to 4.2 microunits per milliliter for healthy adults. A level of 100 even greatly surpasses expected TSH levels for newborns, which reach up to 39 microunits per milliliter.

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