What tests did they use to diagnose your Arteritis? How long were you on 40mg of prednisone, I thought you had to stay at that level for a month? I am having symptoms of PMR and arteritis, but my blood work is normal and 2 years ago I had negative artery biopsy's on both sides. But since then, my left sided headaches have continued off and on. I've read the biopsys and blook work are sometimes normal even if you have it.