The reference ranges of thyroid-stimulating hormone (TSH) and free thyroxine (FT4), known to vary in children compared with adults, also shift considerably in older age, to the degree that the use of ...
Thyroxine and L-thyroxine are two of the 10 most frequently prescribed medicinal products. "One large health insurance company ranks thyroid hormone at fourth place in the list of most-sold ...
High TSH levels usually mean the thyroid is underactive, which is called hypothyroidism. TSH levels can change due to factors like age, sex, and pregnancy. TSH influences thyroid hormones that control ...