Don't panic: A TSH of 4.5 is only borderline high. It will only harm the baby if it is not treated. Most women need more thyroid hormone when they are pregant, but only 25-50% more, not doubling the dose. It is reasonable to increase the dose as soon as you know you are pregnant and then do a thyroid level after 1 month.
Answered 10/15/2014
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