Why Does IVF Have Twins?
In vitro fertilization (IVF) is a process used to help couples conceive a child when traditional methods have failed. The process involves fertilizing an egg outside of the body, then implanting it into the uterus. One of the potential side effects of IVF is the risk of twins or multiples.
The number of embryos transferred during an IVF cycle directly influences the risk of twins or multiples. In the past, the number of embryos transferred was higher and led to an increase in multiple births. However, with advances in technology, doctors are now able to transfer fewer embryos and reduce the risk of multiple births.
Natural twin rates are at about 2%. Put simply, twins are rare. However, the risk of twins with IVF is much higher than the natural rate. The exact risk depends on the number of embryos transferred and the age of the woman. For example, a woman under 35 has a 20-30% chance of having twins if two embryos are transferred. For a woman over 40, the risk increases to 40-50%.
It is important to note that the risk of twins is not the only factor to consider when deciding how many embryos to transfer. Other factors such as the quality of the embryos and the woman’s age should also be taken into account.
In conclusion, the risk of twins with IVF is higher than the natural rate. The exact risk depends on the number of embryos transferred and the age of the woman. It is important to consider all factors when deciding how many embryos to transfer.
