Seasonal variation in one of the hormones used to monitor thyroid function could in turn lead to false diagnoses of subclinical hypothyroidism and unnecessary prescriptions of levothyroxine, says Yale ...

Normal TSH values vary widely depending on age, and the ranges of normal values are typically higher in older adults. This is important, as a select number of patients manifest recurrent symptoms ...

There are several factors that elevate or depress radioactive-iodine uptake and protein-bound iodine quite apart from altered thyroid function. In the course of preparation of this manuscript one of ...

Laboratory reference ranges reflect methods, populations, and policies, and experienced clinicians interpret them in context rather than applying fixed cutoffs theoretically.