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 gray-dun color (grayish/buff body color with a distinct cross on the back) is the original and most common color and thereby the least expensive. As this is being written the most desired colors are black, dark brown (often commonly called chocolate), sorrel (RED) (reddish color in summer coat) and spotted.