Ihave heard so much on the blood test, but how accurate is it? I have heard you really can't go by that number to tell if you have cancer or not, yet they give you that test and use the number as a starting point I guess. I have had alot of pain and when I took the scan they showed cysts on both ovaries and a mass, and endementriosis, thickening of the walls of my uterus, which I have no idea what that is? Anyway, what should the number be? Is there a range meaning everything is ok? If my number is normal, yet I have constant pain, and the scan shows this, what else can they or should they be doing? I just want to understand. Thank you.