Carotid Angiography Carotid angiography (an-jee-OG-ra-fee) is a special type of x ray. This test may be used if the ultrasound results are unclear or don't give your doctor enough information. For this test, your doctor will inject a substance (called contrast dye) into a vein, most often in your leg.
Dawn is defined as the first light of a new day or the beginning of something. An example of dawn is around 6am in September in California. An example of dawn is the beginning of the Computer Age. The definition of dawn is to begin to be understood, daylight or to appear.
Dawn Effect. The dawn phenomenon is a rise in blood glucose that occurs in the early morning hours, usually between 3 and 6 a.m. in people with a typical sleep schedule. The dawn effect is thought to be triggered by a normal predawn increase in the levels of hormones, particularly human growth hormone, that tell the liver to release glucose.