Up to 20 grams: Since the thyroid is a 3 dimensional structure, it is the volume of the thyroid that relates to size. It is actually best assessed by palpation rather than dimensions on an ultrasound. A normal size is up to 20 grams (estimate since no one is removing your thyroid to weigh it). Dimensions on an ultrasound can be deceiving, depending on where the tech measures.
Answered 11/21/2013
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