Because the treatment is simple, effective, and inexpensive, nearly all of the developed world practices newborn screening to detect and treat congenital hypothyroidism in the first weeks of life. Congenital hypothyroidism is the most common preventable cause of mental retardation. Few treatments in the practice of medicine provide as large a benefit for as small an effort. It's really not a big deal since newborn screening detects and is easily able to treat this. Sorry to be a buzz kill on the scare here.
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