A serum TSH result between 0.5 and 2.0 mIU/L is generally considered the therapeutic target for a standard LT4 replacement dose for primary hypothyroidism. A serum FT4 concentration in the upper ...

For more than twenty-five years, TSH methods have been able to detect the TSH elevations that are characteristic of primary hypothyroidism. Modern-day TSH methods however, with their enhanced ...