Twins rate of IVF
In vitro twins rate refers to the proportion of twins among infants obtained through assisted reproductive technology (ART). In vitro fertilization (IVF) refers to the transfer of fertilized eggs to the uterus of pregnant women during in vitro fertilization (IVF). With the progress of reproductive technology, the twin rate of IVF has gradually increased.
First, because of the particularity of the IVF program, multiple fertilized eggs are usually transferred to the uterus in a cycle to increase the chance of successful pregnancy. This is one of the main reasons for the increase of twins rate in IVF. The twin rate of IVF is usually higher than that of natural pregnancy.
Secondly, the twin rate of IVF is also related to the age of patients. Young women usually produce more fertilized eggs in one cycle, which increases the possibility of multiple fertilized eggs transplantation. At the same time, young women have relatively good ovarian function and high quality of fertilized eggs, which is easy to lead to successful pregnancy of multiple embryos.
For older women, however, the ovarian function declines, and the number of fertilized eggs produced in each cycle is small, so the twins rate of IVF is low. Some hospitals will choose single embryo transfer to improve the success rate for older patients in order to reduce the risk of multiple pregnancy.
Risk of multiple pregnancies
A multiple pregnancy is one in which a woman conceives two or more fetuses in one pregnancy. Although some couples dream of having twins or multiple births, multiple pregnancies are accompanied by a series of health risks.
First, multiple pregnancies increase the risk of premature delivery. Due to the limited capacity of the uterus, too many fetuses will increase the burden of the uterus, leading to an increase in the probability of premature delivery. The growth and development of premature infants may not be perfect, and they are prone to a series of health problems.
Secondly, multiple pregnancy also increases the probability of low birth weight. Because fetuses share limited nutrition and oxygen supply in utero, fetuses in multiple pregnancies often cannot obtain sufficient resources, resulting in growth restriction and birth weight below normal level.
In addition, multiple pregnancy also increases the risk of maternal bleeding, gestational diabetes, uterine rupture and other complications. These complications have a certain impact on the health of mothers and fetuses, and need close monitoring and timely treatment.
Measures to reduce the risk of multiple pregnancy
In order to reduce the risk of multiple pregnancy during IVF, some hospitals have taken some effective measures.
First, the risk of multiple pregnancies can be significantly reduced by choosing single embryo transfer during IVF. Single embryo transfer can reduce the twin rate, but it may also reduce the chance of successful pregnancy, so it needs comprehensive consideration.
In addition, doctors can also reduce the risk of multiple pregnancy by observing and evaluating the quality of the fertilized eggs during the IVF cycle and selecting the best one or two for transplantation.
In addition, for older patients, it is also possible to control ovarian reactivity and reduce the probability of multiple pregnancy by reducing hormone dose.
Summary
The twin rate of IVF is affected by many factors, such as the number of fertilized eggs transferred, patient age, etc. The higher rate of twins will also increase the risk of multiple pregnancies. Multiple pregnancy may lead to premature delivery, low birth weight and a series of health problems. In order to reduce the risk of multiple pregnancies, the hospital has taken some measures, such as selecting single embryo transfer, observing the quality of fertilized eggs and controlling hormone dosage. In the process of implementing IVF, doctors need to comprehensively consider women's personal conditions and physiological characteristics to achieve the best pregnancy results.
