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.
The house ghost, who in life was the daughter of the house's founder Rowena Ravenclaw, is the Grey Lady. Ravenclaw corresponds roughly to the element of air; the House colours blue and bronze were chosen to represent the sky and eagle feathers respectively, both having much to do with air.