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.
Standard. Blue: Color is a slate blue, as dark as possible showing no brown patches or silvering. Eye color is dark ruby or black. Variegated: Variegated rats to be shown in any recognized color and are similar to Hooded rats but instead of a spine marking, will have patches and flecks of color on the back side.