Is the "Normal" TSH Range Actually Normal?

As of March 2007, at most laboratories in the U.S., the official "normal range" for the Thyroid Stimulating Hormone (TSH) blood test runs from approximately .5 to 5.0. But did you know that almost five years ago, some laboratory experts and doctors began recommending that a different range -- .3 to 3.0 -- be followed? So, what's really normal -- the old or new range? Find out more now.