The disappearance of the yolk sac in pregnancy without fetal heart and buds is considered in two cases, one is that the pregnancy is still short, the other is that the embryo has ceased to exist; for the first case, weekly blood tests and ultrasound examination can be performed, and for the second case, if it is determined that the embryo has ceased to exist, it is necessary to clear the uterus as soon as possible.
In the first case, the yolk sac develops from the embryo and later develops into a germ. The yolk sac is a sac-like structure wrapped by the gestational sac, which can provide a good nutritional base for the growth and development of the embryo. If the yolk sac is not yet seen, it is considered that the gestation period is still short and the yolk sac has not yet developed.
The second situation is for more than 7 weeks visible gestational sac, but if the patient has not yet seen the yolk sac and fetal buds and fetal heart, basically can be concluded in the yolk sac development before the development of the yolk sac has ceased to develop, at this time you need to check the HCG and progesterone to assist in the diagnosis; once determined to be the embryo is arrested, the uterus should be cleared as soon as possible.
If the yolk sac disappears without fetal heart and buds, you need to consult a doctor as soon as possible to determine the specific cause of the corresponding treatment.