Thyroid-Stimulating Hormone (TSH). Guide. A thyroid-stimulating hormone (TSH) blood test is used to check for thyroid gland problems. TSH is produced when the hypothalamus releases a substance called thyrotropin-releasing hormone (TRH). TRH then triggers the pituitary gland to release TSH.
A Raven is black but depending on which way the light hits it they change to other colors like bluish, dark red, or greenish. There are white Ravens but are not albino.
Behind the scenes. 1  In the books, Ravenclaw colours are blue and bronze; however, in the films they were changed to blue and silver. Likewise, Ravenclaw's symbol is an eagle in the books and a raven in the films (though in the last film an eagle does appear as the Ravenclaw mascot).