What does gray zone mean on a blood test result?

Can lung cancer be passed from generation to generation? Why don't you become ill the moment a virus enters your body? What is it called when you cannot tell whether something has really happened to you or not? Do tadpoles have two chambered heart? If you are not ovulating can this problem be corrected? As a human ever been born without any teeth? During a stroke blood flow to what vital organ is interrupted? Which STD may lead to cancer of the liver? Why hemophilia is a serious disorder? What does delay means? Do you have antibodies that react with the antigens of your own RBC's true or false? How can an injury to a peripheral nerve cause loss to both sensory and motor function? What should you do if your head hurts? What is true regarding endocrine glands? Why does the baby dr have to do a pap smear on a 12 yaer old? Can the sex of the baby be determined during a ectopic pregnancy? How is Red blood cell similar to cheek cell? How can common fitness related injuries be treated at home and when should medical care be sought? How is clotted blood obtained? What does the long intestine do?