How often are IVF twins?

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How often are IVF twins?

IVF is a method of cultivating embryos in the laboratory through assisted reproduction technology, and then implanting the embryos into the mother's uterus to assist in pregnancy. In the process of IVF, twins sometimes occur, that is, two embryos implanted at the same time can successfully develop into babies. So, what is the twins frequency of IVF? Next, we will elaborate from several aspects.

Number of embryos and incidence of twins

In IVF treatment, doctors usually implant multiple embryos into the mother's uterus to improve the success rate. Depending on the hospital's strategy and the patient's situation, the number of embryos implanted may vary. When multiple embryos are implanted, one or more situations may occur: 1) All embryos are not implanted, resulting in infertility; 2) Some embryos are implanted to produce singletons; 3) All embryos are implanted to produce twins or multiple births.

Therefore, the number of IVF embryos is closely related to the incidence of twins. Research shows that when two embryos are implanted, the frequency of twins is about 30% to 40%; When three embryos are implanted, the frequency of twins increases to 50% to 60%. When more embryos are implanted, the frequency of twins may further increase.

Age and incidence of twins

Female age is also an important factor affecting the frequency of IVF twins. Young women usually release only one egg in the process of natural ovulation, so it is only possible to develop into a singleton when an embryo is implanted. However, with the increase of age, the ovarian function of women declines, and multiple eggs may be released. At this time, the incidence of IVF twins will increase.

The study found that women under 30 years old have a relatively low probability of getting twins through IVF, about 20% to 25%. Among women over 35 years old, the frequency of twins rises to about 30% to 35%. Therefore, age is another key factor in the frequency of IVF twins.

Embryo quality and incidence of twins

The embryo quality also has some influence on the frequency of twins in IVF. Embryo quality includes embryo morphology, cell division, etc. Generally speaking, embryos with normal morphology and good development are more likely to successfully implant and develop into infants.

If the quality of implanted embryos is poor, some or all of them may not be implanted, thus affecting the incidence of twins. Therefore, in IVF treatment, doctors usually choose high-quality embryos for implantation to improve the probability of twins.

Summary

To sum up, the twin frequency of IVF is mainly affected by the number of embryos, age, embryo quality and other factors. Implantation of multiple embryos, aging and good selection of embryos may increase the incidence of IVF twins. However, with the progress of medical technology, the strategy of IVF embryo implantation is also changing. Doctors are pursuing a higher rate of single embryo implantation to reduce the risk of multiple pregnancy.