I would recommend that you not start on any Prednisone now. My CT scan did not show anything so that is not the important test as far as the Temporal Arteritis. The most important test is the Sed Rate and you may want to try to get it done today. The other thing is you might want to go to the emergency room and they will do all the test right away. They listed the Temporal Arteritis as life threatening on my emergency room papers. It is very scary and my father went blind in his 60’s and that has always been something I was afraid of happening to me. At least your doctor ordered test on you and seemed to recognize what it might be. That is better than any of my doctors in Orlando. The biopsy will show the Giant Cell Arteritis even a week or so after starting on the medicine. This is not a disease you want to mess around with. Good Luck - do keep me posted. My recommendation holds - go to the emergency room.