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.
Like death, loss, and suffering, the raven is part of the speaker's life and will remain so. The raven casts a shadow on the speaker's life and seems to threaten the speaker. He comes unexpectedly and acts as it pleases without any concern for the effect it has on others.