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.
From Historica Canada. The Raven This site focuses on the symbolism of the Raven in Northwest Coast Aboriginal culture. Scroll down the page to see depictions of ravens in Aboriginal works of art. From the Spirit of the West Coast Native American Art Gallery.