Transplantation 26 days HCG low but also up to consider the hope is not great, may be ectopic pregnancy, embryonic dysplasia and so on. 1. Ectopic pregnancy: transplantation generally refers to in vitro fertilization (IVF), which is the process of removing an egg from a woman’s ovary and fertilizing it with sperm outside the body, and then transplanting it into the uterine cavity. After transplantation into the uterine cavity, the fertilized egg will be free for 3-5 days to choose the appropriate site for implantation. If it wanders to the uterine horn, cervix and other parts of the uterus, forming ectopic pregnancy, the embryo can not develop normally, the HCG value will be low, and there is no hope in this case. 2. Embryonic dysplasia: If there is embryonic dysplasia, the gestational trophoblast cells will atrophy and necrosis, which will maintain the HCG value will be lower than normal, the embryonic dysplasia will also be miscarried, so the hope is also relatively small. Transplantation 26 days HCG value is low but also up recommended to go to the hospital for a detailed examination, clear cause symptomatic treatment. If it is ectopic pregnancy, it should be handled as soon as possible to avoid danger.