The term PGD, preimplantation genetic diagnosis, is often loosely used to refer to any testing performed on an embryo prior to it being transferred to the uterus. However, the distinction should be made between the terms PGD and PGS. 1  PGD, preimplantation genetic diagnosis, involves removing a cell from an IVF embryo to test it for a specific genetic condition (cystic fibrosis, for example) before transferring the embryo to the uterus.
Hepatitis B E Antigen (HBeAg) If the HBeAg test is positive, it means that: 1  You have high levels of the hepatitis B virus in your blood.  You may be very contagious to others.
chris. 1  I recently attempted to donate blood however, I received a letter from the blood center saying that I tested positive/reactive to Hepatitis B Core Antibody, but negative for Hepatitis B Surface Antigen. However, three years ago before entering college I received the set of three immunizations against Hepatitis.